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1350-466
SR
OR
294069762
SQ*- 3,1946#
öeal’Cn H001
N
y
D. s. GREY
2,
,762
OPTICAL SYSTEM
Filed June- 17,9, 1943
2 Sheets-Sheet 1
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FIG.
X266#
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S¢Pt~ 3, 1946.
_
D. s. GREY
OPTICAL
2,406,762
SYSTE“
Filed June 19, v164e.
I
'
2 sums-snm 2
MJ@
INVENTOR,
BLOMmy
ÖGBÍCÜ KOÜÍ
,
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Patented Sept. 3, 1946
«-
n
2,406,752
UNITED STATES PATENT OFFICE
2,406,762
OPTICAL SYSTEM
David S. Grey, Cambridge, Mass., assigner to
Polaroid Corporation, Cambridge, Mass., a cor
poration of Delaware
l
Application June 19, 1943, Serial No. 491,493
14 claims. (Cl. 88-57)
2
This invention relates to optical systems and
more particularly to athermalizatlon of optical
ized to a predetermined extent for focal point by
one glass lens; and
systems comprising one or more lens elements of
organic resin or plastic.
In an optical system comprising one or more
lens elements formed from an organic resin or
Fig. 2 is a similar view of another lens system
wherein a plurality of plastic lenses are substan
tially completely athermalized for focal point by
a, glass lens.
In accordance with the present invention, a
system of lens elements, such as a photographic
plastic, changes in temperature produce varia
tions in the index of refraction, curvature, and
thickness of each plastic lens and thereby change
the position of the focal surface of the system.
It is inconvenient and frequently impractical to
rc-focus the lens system to correct for these
thermal effects, and accordingly, it is one object
of the present invention 1to provide a novel optical
system comprising one or more plastic lenses, 15
objective, wherein a plurality of the elements are
formed of plastic, may be athermalized for focal
point by providing the system with one or more
glass lens elements. To accomplish this an equa
tion similar to the achromatization equation for
the focal point is utilized in the lens computation
and an infinite nu value is assigned tothe glass lens
the lenses of said system being selected and ar
or lenses and a convenient iìnite nu value, for ex
ranged in a novel manner. so that there is no
ample 100, to the plastic lenses in said equation.
The athermalization is thus achieved with the
glass serving as the "thermal crown” and the
appreciable variation in focal point due to
changes in temperature.
Another object is to provide a novel arrange 20 plastic as the “thermal ilint.” Such an equation
ment of, and a novel method of arranging lens
thus involves an expression for thermal nu value,
elements in an optical system wherein all but
instead Jof color nu value 0r dispersion as in the
the first are formed from en organic resin and the
case of achrornatization. Specifically, the ther
ñrst is of glass and athermalizes the entire sys
mal nu value for a material may be determined
tem for focal point.
25 from the reciprocal of the quantity
A fui-.ther object is to provide a novel ather
malized system of lens elements wherein a plu
rality of lenses subject to appreciable tempera
ture effects are athermalized for focal point to a
predetermined extent by one or more lens ele 30 wherein n is the index of refraction of the ma
ments of a material negligibly affected by
terial, C'r is the coefficient of linear expansion of
changes in temperature, as for example one of
the material and
the optical glasses.
Still another object is to provide a, novel opti
¿a
dT
cal system comprising one or more glass lens ele 35
ments and a plurality of plastic lens elements
is the rate of change of the index of refraction
wherein athermalization of the vplastic elements
of the material with change in temperature, it
is achieved lto a desired extent by the glass ele
being noted that the factors involved are prop
ment or elements in a manner analogous to the
erties inherent to a material. As will presently
achromatization of a lens system for focal point. 40 appear, the plastics or “thermal flint” materials
'I'he above and other objects and novel features
described herein have similar coeñlcients of linear
expansion as well as similar rates of change in
of this invention will more fully appear from the
index per degree centigrade and hence will have
following detailed description when the same is
similar thermal nu values. This athermalization
read in connection with the accompanying draw
ings. It is to be expressly understood, however, 45 is approximated if the glass lens elements are
constructed so that the sum of the “convergence
that the drawings are for purposes of illustration
factors” of said elements is equal to approxi
only and are not intended as a definition of the
mately the power of the lens system, i. e., if the
limits of the invention, reference being primarily
had for this latter purpose to the appended `
claims.
In the drawings:
Figure 1 is a sectional View of a lens system
embodying one form of the invention wherein a
plurality of plastic lenses are partially athermal
sum of the convergence factors of the plastic '
50 lenses is equal to approximately zero.
The con
vergence factor is the product obtained when the
power of each of said glass elements is multiplied
by a position factor (1-C’)2, C being the frac
tional convergence of the paraxial ray on reach
55 ing said element. If .the above condition is satis
3
2,406,7651
ned, athermalization for focal point is approxi
mately obtained regardless of the number of glass
lenses in the system and regardless of the loca
tion of said lensesl relative to the plastic elements
of the system.
It will be appreciated that when only a, single
lens element of glass is employed the power of
that element multiplied by the position factor
for that element should be approximately equal
in temperature, is (l00-N)% and the system is
thus completely athermalized for focal point.
Referring to the drawings,` there is shown inFig. 1 a photographic objective comprising a plu
rality of plastic lens elements and athermalized
Ain accordance with the present invention. In
the form shown, said objective comprises live
lens components, I, II, III, IV, and V, wherein
foremost lens component‘I is the athermaliza
to the power of the entire system.
10 tion lens and is formed preferably of crown glass,
It is preferable in optical systems, because of
such as Crown 1. The remaining lens elements
the lesser expense, to utilize as many elements of
of the system are formed preferably of two suit
plastic as possible, and accordingly, it is prefer
able organic resins or plastics which have the
able wherever possible to athermalize a lens sys
necessary differences in indices of refraction and
tem comprising plastic elements for focal point 15 nu values .to constitute flint and crown mate
by a single lens element of glass. It is also de
rials for the system. A satisfactory resin for the
sirable, because of the greater hardness of Ithe
crown material is cyclohexyl methacrylate, which
glass as compared to the plastic, to use the glass
has an index of refraction (ND) of approximate
element as the outside or ñrst lens of the system
'ly 1.506, a color nu value or dispersion (Vl of
so that said glass element serves as a protection 20 approximately 57, a. coefficient of linear expan
for the remaining elements of the system. With
sion of 7.6 X 10-5, a rate of change in index of
this arrangement of lenses in a given optical sys
refraction of _0.000131 per degree C for the so
tem, i. e., a ñrst glass lens and remaining lenses
dium D line and in the illustrated system lenses
of plastic, it is possible, according to the present
II, IV, and V are formed of this material. For the
invention, to athermalize the system by selecting 25 flint material styrene, which has an index of re
the glass element so that the focal length there
fraction (ND) of approximately 1.592, a color nu
of is approximately the same as .that of the total
value or dispersion (V) of approximately 31, a
lens system.
coeñîcien-t of linear expansion of 7.1 X 10-5, and
The athermalization obtained in the above
a rate of change in index of refraction of
manner, i. e., by having the sum of the converg 30 _0.000136 per degree C for the sodium D line,
ence factors of the athermalization lenses equal
may be employed, and lens III is formed of this
-to the power of the system, approximates a com
material.
plete or 100% athermalization for focal point for
Lens I has a power equal to approximately 4/=,
the plastic lenses. The thermal effect on the
that of the system and, accordingly, provides ap
other lenses in the system, i. e., the athermaliza 35 proximately 80% athermalization for focal point
tion lenses, is negligible, and accordingly, there
of plastic lenses II to V, the system being de
is obtained substantially 100% athermalization
signed for a housing which is adapted to provide
for the entire system.
` '
the additional 20% athermalization necessary to
It may be desirable, however, to obtain some
achieve substantially complete athermalization
lesser or greater percentage of athermalization 40 for focal point.
by means of the athermalization lenses because
In Fig. 2 there is illustrated a photographic
there may be a partial compensation for, or a
objective comprising six lens components, IA, IIA,
greater variation in, temperature effect on focal
IIIA, IVA, VA, and VIA wherein the foremost lens
point due to other causes than the thermal ef
IA is formed of an optical glass, such as dense
fects on the lenses of high thermal coefficient. 45 barium crown, lenses IIA, IVA, VA, and VIA are
For example, the linear expansion or contraction
formed of cyclohexyl methacrylate and lens IIIA
with temperature of the housing for the lens sys
is formed of styrene. In this system lens IA has
tem may partially athermalize for focal point.
a power equal to approximately that of the sys
Accordingly, to obtain a substantially complete
tem, i. e., 98% of the power of the system, so that
over-all athermalization for the lens system, it 50 lenses IIA to VIA are substantially entirely ather
may be necessary to obtain, by means of the
malized for focal point by said glass lens.
athermalization lenses, an athermalization
Although styrene and cyclohexyl methacrylate
which differs from 100%. In this connection it
are preferred, it is to be understood that the
has been determined that the percentage ather
plastic lenses may be formed of any resins which
malization obtained by the athermalizíng lenses 55 are sufñciently transparent, homogeneous and
is in direct proportion to the ratio of the sum of
hard, to be used optically, and preferably those
the convergence factors of the athermalizing
which may be accurately cast by polymerization
lenses to the power of the optical system. As a
in molds. Example of further resins of this
result, when .thermal effects, for example, on the
character are me thyl methacrylate, benzyl
housing of a lens system cause a partial ather 60 methacrylate, phenyl methacrylate, and ortho
malization or correction of N % forl the change in
chlorostyrene. The vinyl compounds, such as
focal surface with temperature, the athermaliz
ing lens elements may be arranged and com- ’
styrene, orthochlorostyrene, and other members
of «the styrene family and esters of acrylic and
puted so that the sum of the convergence factors
alpha-substituted acrylic acids, and particularly
thereof is such that the ratio of said sum to the 65 of methacrylic acid, provide polymerizable mate
power of the system is equal to
rials best suited for forming the plastic lenses.
In each of the tables below relating to the illus
100
trated lens systems, the column “Radius” refers to
100
the radii of the spherical surfaces as measured in
70 the same linear units as used to measure the~
times the power of the system. Thus, the
focal length of the system illustrated, as for ex
amount of athermalization Iobtained optically,
l. e., by means of lenses having substantially zero
coefûcient of thermal expansion and having their
ample, millimeters. The column designated
“Thickness” refers to the thickness of the lenses,
also the air gaps between lenses as measured on
optical properties affected negligibly by- changes 75 the axis of the lens system in the same linear
QUCII bil “UU
2,406,762
5
umts as those vused to measure the “Radius.”
'I'he letter "t" indicates lens thickness and the
letter "d" air spaces, d10 in the nrst table being
the distance from Re to the focal surface, and
du in the second table being the distance be.-Y
tweenRu and the focal surface. The term “Nn”
is used to designate the index of refraction of
the materials for the lenses as measured for the
yellow “D" line of a sodium arc. The column “V”
designates nu value
ND-l
Np-Nc
i. el.î reciprocal dispersion, for the lens materials
use
.
'
The following table sets out the constructional _
[Focal Length=l90l
Radius
I _______________________ __
Thickness
R1=+120.1
t1=13.8
Rn=-1,848 5
dz=0
II ...................... -_ R3=+75. 2
ì3=35. 0
R¿=+44. 7
d4= 15. 8
R5= _67. 3
ls=4. 5
III ..................... -_
Nn
1.523
l. 506
'
t1--46. 2
R1=-107.4
t9=19. 2
that lens, where C is the fractional convergence
of a paraxial ray incident on said lens.
Since certain changes in carrying out the above
process and in the constructions set forth which
10 embody the invention may be made without de
parting from its scope, it is intended that all
matter contained in the above description, or
shown in the accompanying drawing shall be
interpreted as illustrative and not in a limiting
15
sense.
\
1. 592
31
57
material negligibly subject to thermal effects and
having a predetermined index of refraction, dis
1. 506
57
persion and a power which is related to the power
da=0. 0
V ...................... _l Rs=+218. 8
of a lens is to be understood to mean the product
of the position factor (l-C)2 and the power of "
1. 506
Rs=~l-71. 1
IV _____________________ _. Rß=+71.1
'
In the claims the term "convergence factor”
It is also to be understood that the following
claims are intended to cover all of the generic
and speciñc features of the invention herein de
scribed, and all statements of the' scope of the
V 20 invention which, as a matter of language. might
be said to fall therebetween.
What is claimed is:
57
1. A method of forming an athermalized lens
57
system, comprising, providing a. lens element of
data for the lens system of Fig. 1:
Lens
erties substantially unaffected by >changes in tem
perature within ordinary limits.
of the systemmäs’a’"vwhölëî'bptically correcting
said element negligibly subject to thermal effects
'I'he above photographic objective has an f/4.5 30 for at least one aberratign`with_„a_ plurality of
Ro=-114.0
d1n=140.7
aperture and is well corrected over a 40 degree
total ñeld.
The following table sets out the constructional
components apprecfably‘subjeéiîíô thermal effects
each selectedlto lhaveapproximately equal ther
mal nu values and a predetermined index of re
fraction, dispersion‘and a power related to the
35 power of the system as a whole, and arranging
said components appreciably subject to thermal
effects and said element negligibly subject to
Nn
V
thermal elïects in axial alignment at spacings
which satisfy the condition that the sum of the
1.611 58.8
.40 convergence factors of said components appre
data for the photographic objective of Fig. 2:
[Focal Length=l001
Lens
IA _____________________ ._
IIA .................... _.
IIIA.. .................. _IVA.. .................. -_
Radius
Rx=+48.24
h=7.6
Rz=+452. 49
d2=0
R3=+33.
R4= - 153. 84
R4==-l53.84
R5=+27.85
t3=14. 8
1.506
57
i|=1. 8
d5=4. 6
1. 591
31
, ta=l.8
1.506
57
1. 506
57
1. 506
57
R¢=-66.22
R1=+46. 30
VAH .................. __
VIA ................... -_
Thickness
ì
d1=6. 95
I~7s=+l69. 49
R9= -- 106. 38
Rm=+88. 8S
is=5. 0
dc= 0
l1o=6. 0
R11=-74.07
dl1=66- 1
ciably subject to thermal effects approximately
equals zero while the convergence factor for said
element negligibly subject to thermal effect ap
proximates the power of the system.
2. A method of forming an athermalized lens
45
system, comprising, providing a plurality of lens
elements of material negligibly subject to ther
mal effects and each having a predetermined
index of refraction, dispersion and a power which
The above photographic objective has an f/3
aperture and is well corrected over a 35 degree 50 is related to the power of the system as a whole,
optically correcting` said elements negligibly sub->
total field.
ject to thermal effects for at least one aberration
There is thus provided a novel system com
with a plurality of components appreciably sub
prising a. plurality of lens elements of organic
ject to thermal effects each selected to have ap
resin or plastic and one or more athermalizing
lens elements of glass, said elements being ar 55 proximately equal thermal nu values and a pre
determined index of refraction, dispersion and a
ranged in a novel manner to eifect a predeter
power related to the power of the system as a
mined degree of athermalization for the system.
whole, and arranging said components appreci
A novel method is provided for selecting ather
ably subject to thermal effects and said elements
malization elements whereby the sum of their
convergence factors bears a predetermined rela 60 negligibly subject to thermal effects in axial
alignment at spacings which satisfy the condi
tioned relation to the power of the system in
tion that the sum of the convergence factors of
accordance with the degree of athermalization
said components appreciably subject to thermal
for focal point for the plastic lenses which is
eiïects approximately equals zero while the con
desired.
Although the invention is primarily directed to 65 vergence factor summation for said elements
negligibly subject to thermal enects approximates
the athermalization of lens systems of plastic, it
the power of the system.
is not limited thereto and is applicable to any lens
system comprising a plurality of components hav
3. A method of forming a lens system having
ing coefficients of thermal expansion of such mag
.N percentage of athermalization for focal point, ‘
nitude that changes in temperature will produce 70 comprising, providing at least one lens element
an appreciable variation in the back focal length.
of material negligibly subject to thermal effects
To athermalize a system in accordance with the
and having a predetermined index of refraction,
dispersion and a power which is related to the
invention, the lens element or elements which
are used to athermalize need only have negligible
power of the system as a whole, optically correct
thermal expansion and have their optical prop 75 ing all such elements- negligibly subject to ther
2,406,752
7
8
7. Alens system predeterminedly athermalized'
mal effects for at least one aberration with a
plurality of components appreciably subject to
thermal effects each selected to have approxi
for focal point, comprising, a lens element ot
glass having a predetermined index of refraction,
mately equal thermal nu values and a predeter
mined index of refraction, dispersion and a power
related to the power of the system as a whole,
dispersion and a power which is related to the
power of the system as a whole, and at least one
lens of plastic which optically corrects the sys
and arranging said components appreciably sub
ject to thermal eil'ects and all such elements
negligibly subject to thermal eiïects in axial
alignment at spacings which satisfy the condi 10
tion that the convergence factor summation for
all such elements negligibly subject to thermal
effects approximates the power of the system
multiplied by N/ 100.
tem for at least one aberration and which has a
predetermined index of refraction, dispersion and
a power related to the power of the system as a
whole, all such plastic lenses having approxi
mately equal thermal nu values, and said lenses
being arranged in axial alignment at spacings
with respect to each other to satisfy the condition
that the product of the power of said glass lens
4. A method of forming an athermalized lens l15 and its position factor forms a ratio with the
power of the system which is directly proportional
glass having a predetermined index of refrac
to the degree of athermalization for focal point
desired for the system.
`
tion, dispersion and a power whicl'i- is related
8. A lens system predeterminedly athermalized
to the power of the system as a whole, said glass
system, comprising, providing a lens element of
lens element being negligibly‘subject to thermal 20 for focal point, comprising, at least one lens ele
ment of glass of a predetermined index of re
effects, optically correcting „said glass element
for at least one aberration' with a plurality of
lens components of plastic appreciably subject
to thermal effects, each plastic element being se
fraction and dispersion and a power which is
related to the power of the system as a whole and
a plurality of lens components of plastic optically
lected to have an approximately equal thermal 25 correcting the system for at least one aberration
and having predetermined indices of refraction,
nu value and a predetermined index of refrac
dispersion and individual powers related to the
tion, dispersion and a power related to the power
power of the system as a whole, all such plastic
of the system as a whole, and arranging said plas
components having approximately equal thermal
tic components and said glass element in axial
alignment at spacings which satisfy the condi 30 nu values, and said elements and components
being arranged in axial alignment at a spacing
tion that the sum of the convergence factors of
with respect to each other to satisfy the condi
the plastic components approximately equals zero
tion that the sum of the products obtained by
while the convergence factor for said glass ele
multiplying each such glass element by its posi
ment approximates the power of the system.
5. A method of forming an athermalized lens 35 tion factor forms a ratio with the power of the
system which is directly proportional to the de
system, comprising, providing a plurality of lens
gree of athermalization for focal point desired
for said system.
9. A lens system athermalized for focal point,
is related to the power of the system as a whole,
said glass lens elements being negligibly subject 40 comprising, at least one lens element of material
negligibly subject to thermal effects and having a
to thermal eiîects, optically correcting‘said glass
elements of glass each having a predetermined
index of refraction, dispersion and a power which
elements for at least one aberration with a plu
rality of lens components of plastic appreciably
subject to thermal effects, and each selected to
` predetermined index of refraction, dispersion and
a power which is related to the power of the sys
tem as a whole, and at least one lens component ~.
have an approximately equal thermal nu value 45 of a material appreciably subject to thermal
effects which optically corrects the system for at
and a predetermined index of refraction, dis
least one aberration and has a predetermined
persion and a power related to the power of the
index of refraction, dispersion and a power re
system as a whole, and arranging said plastic
lated to the power of the system as a whole, all
components and said glass elements in axial
alignment at spacings which satisfy the condi
tion that the sum of the convergence factors of
50 such lens components appreciably subject to
thermal effects having approximately equal ther
mal nu values, said lenses being arranged in axial
alignment at spacings with respect to each other
while the convergence factor summation for said
to satisfy the condition that the sum of the con
glass elements approximates the power of the sys
tem.
55 vergence factors of all such lenses negligibly sub
ject to thermal eifects approximates the power of
6. A method of forming a lens system having N
said system.
percentage of athermalization for focal point,
10. A lens system havingN percentage ather
comprising, providing at least one lens element of
malization for focal point, comprising, a fore
glass having a predetermined index of refrac
tion, dispersion and a power which is related tc 60 most lens of glass having a predetermined index
of refraction, dispersion and a power of approx
the power of the system as a whole, each such
imately N/ 100 times the power of the system, and
glass element being negligibly subject to thermal
a plurality of plastic lenses optically correcting
effects, optically correcting all such glass ele
the glass element for at least one aberration and
ments for at least one aberration with a. plurality
of plastic lens components appreciably subject 65 each having approximately equal thermal nu
values and a predetermined index of refraction,
to thermal effects and each selected to have an
dispersion, and a power related to the power of
approximately equal thermal nu value Aand a pre
the system as a whole, said plastic lenses being
determined index of refraction, dispersion and a
the plastic components approximately equals zero
power related to the power of the system as a
axially aligned with said foremost glass lens at '
whole, and arranging said plastic lens compo 70 spacings which satisfy the condition that the
sum cf the convergence factors of the plastic
nents and said glass lens elements in axial align
lenses approximates the product of
ment at spacings which satisfy the condition that
the convergence factor summation for all such
glass lens elements approximates the power of
the system multiplied by N/100.
'
l-N
.
100
and the power of the system.
lib. Urncs
oearCn Hoof
2,406,762
r
10
of the-system', in combination', at least one lens
of glass having a predetermined index ci.' refrac-A
tion, dispersion and a power related to the power>
11. An athermalized optical system, comprising,
a, foremost lens element of glass which has a pre
determined index of refraction and a predeter
mined dispersion and which substantially pro
of the system as a whole, and a plurality of plas
vides the power of the system, and a plurality of
tic lenses each having an approximately similar
thermal nu value and a predetermined index of
refraction, a dispersion and a power related to-
components 0f plastic which optically correct the
glass element for at least one aberration, said
plastic components having approximately similar
the power of the system as a whole, said glass and
thermal nu values and each of said components
plastic lenses being axially aligned andmounted
having a predetermined index of refraction, dis 10 within the housing to have the convergence factor
persion and a power which is related to the
summation for all such glass lenses approximately
power of the system as a whole, and said glass
equal to
element and said plastic components being axially
100-N
aligned at spacings such that the sum of the
100
convergence factors of said plastic components
is approximately zero while the convergence fac
times the power of the system whereby to ather
tor for said glass element approximates the power
malize the system by (100-N) %.
of the system.
14. A method of athermalizing for focal point a
12. A partially athermalized lens system hav
lens system having at least one lens element of
ing lens means comprising at least one glass lens 20 glass of predetermined index of refraction, dis
of predetermined index of refraction, dispersion
persion and a power related to the power of the
and a power related to the power of the system
system as a whole and a plurality of lens com
as a whole, and a plurality of plastic lenses N%
ponents of plastic which optically correct each
athermalized for focal point by such glass lens
such glass lens element and which each have ap
means and optically correcting the glass lens 25 proximately similar thermal nu values and a pre
means, said plastic lenses having approximately
determined index of refraction, dispersion and a
equal thermal nu values and each having a pre
power related to the system as a whole, compris
determined index of refraction, dispersion and
ing, arranging each said glass lens element and
plastic lens components in axial alignment with
whole, all said lenses being arranged in axial 30 each other at spacings to satisfy the condition
a power related to the power of the system as a
that the sum of the products obtained by multi
plying the power of each said glass element by
its position factor equals approximately the power
alignment at spacings such that the sum of the'
convergence factors of the plastic lenses is ap
proximately equal to
100-N
< 100 )%
of the system multiplied by
35
of the power of the system
while mounting said components in a housing of
13. In a lens system having a plurality of glass
a. character which provides the system with N %
and plastic lenses mounted in a housing which 40 athermalization for focal point.
provides N% athermalization for the focal point
DAVID S. GREY.
_
88. @F111
¿5,17
-
»
_
Certiñcate of Correction
Patent No. 2,406,7 62
<`-`~~-
September 3, 1946
DAVID S. GREY
It is hereby certified that errors appear in the printed specification of the above
numbered patent requiring correction as follows:
o
lineseffects;
60 and 61, strike out “relationed”; column 6, line 43, for the
WordColumn
“effect” 5,read
and that the said Letters Patent should be read with these corrections therein that
the same may conform to the record of the case in the Patent Oñìce.
Signed and sealed this 6th day of June, A. D. 1950.
[am]
THOMAS F. MURPHY,
Assistant Uommz'm'oner of Patents.
Certificate o! Correction
Patent No. 2,406,762
y
_
_
~ “
September 3, 1946
DAVID S. GREY
It is hereby certilìed that errors appear in the printedspeciñcation of the above
numbered patent requiring correction as follows:
linesefects;
60 and 61, strike out “relationed”; column 6, line 43, for the
wordColumn
“effect”5,read
and that the said Letters Patent should be read with these corrections therein that
the same may conform to the record of the case in the Patent Office.
Signed and sealed this 6th day of June, A. D. 1950.
[BILL]
THOMAS F. MURPHY,
¿insistantl Oammíasz'oner of Patents.
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