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Патент USA US2116244

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May 3, 1938.
G. |_. KING
Filed oci. 7, 19s5`
l 2,116,244
Patented May 3, 1938
George L. King, Syracuse, N. Y.
Application October '7, 1935, Serial No. 43,899
1 Claim.
(Cl. 250--2'7.5)
This invention relates to a process of evacuat
It is an object of this invention to ñnd a new and
jects of the invention, reference should be had
to the following detailed description, taken in
connection with the accompanying drawing, in
improved process and getter material, suitable for
ing radio tubes and of getters employed therein.
5 use with evacuated vessels having a metallic en
velope such as metal radio tubes.
In the manufacture of radio tubes with a glass
envelope, it has been customary to place the
getter material within the envelope and then to
10 vaporize it by the use of high frequency currents.
With this method of vaporization the mechanical
support afforded the getter material has taken
the form of a more or less closed cup having a
large liat rim.
When, however, a metal envelope is used in the
manufacture of radio tubes, the getter material
is placed in intimate thermo contact with the
metal wall of the tube so that it may be vaporized
by heat applied to the exterior of the tube at that
20 point.
In order that the vaporization may take place
with this system without undue heating of the
Wall of the tube and Without other manufactur
ing difficulties, it has been proposed 'to drop a
25 pellet of getter into a little indentation in the
interior wall of the tube and then weld over it a
small piece of nickel or other metal or screen.
This has involved considerable labor and incon
venience and it has increased the cost of tubes
30 materially. Several steps are required to place
the pellet in position, then to position the metallic
ribbon or screen and weld it into place.
It is an object of this invention to provide a
new and improved getter which will function sat
35 lsfactorlly with metallic tubes with a minimum
of labor and a maximum of efficiency.
It is a
further object to provide a getter which is ready
for immediate mounting into the tube without the
necessity of pre-forming the tube in any manner.
In accordance with this invention the getter
material is bonded in a suitable manner to a
metallic support of a form andynature suitable
for welding to the interior of the metallic en
velope and then the whole is ñrmly attached to
45 the envelope as by welding.
The invention accordingly comprises the sev
eral steps and the relation and order of one or
more of such steps with respect to each of the
others, and the device embodying features of
O construction, combinations of elements and ar
rangement of parts which are adapted to effect
such steps, all as exemplilied in the following
detailed disclosure, and the scope of the applica
tion of which will be indicated in the claim.
For a fuller understanding of the nature and ob
In the drawing the Figure l is a plan view of É
a getter embodying this invention.
Figure 2 is a longitudinal section of the same
on the line 2--2 of> Figure l.
Figure 3 is a similar view showing the getter
applied to the inner wall of the envelope before 10
In carrying out this invention, the getter mate
rial Ill, is formed into a pellet within a recess
II, in a nickel sheet I2, the nickel sheet having
substantially the curvature of the inside wall of
the envelope I3 in which the getter is to be used.
In some instances, however, I may prefer to make
it of less curvature so that the pellet itself is held
firmly against the wall.
To' achieve this result I have found it practical 20
to employ a getter material in powdered' form
which is placed on a metallic sheet I 2 which is
then indented as at I I, at the same time that the
getter material is compressed into a pellet I0 _
within the indentation. This results in the ior- 20
mation of the getter shown in Figures l and 2,
and in its preferred form it will be noted that
the getter material extends beyond the outer
walls of the indentation II, so as to touch the
wall of the tube.
The sheet I2 is bent to conform to the inner
wall of the container I3 as shown in Figure 2
and in use it is placed against the inner wall
as shown in Figure 3 and spot-welded to it as 35
shown at I4. At this step, by reason of the fact
that the pellet of getter extends beyond the edges
of the indentation, it is held ñrmly'against the
walls of the envelope itself so that when heat is
applied externally to the envelope it is immedi- 40
ately transmitted to the getter.
A getter made in accordance with this inven
tion is practical and eiiicient in use and avoids
considerable labor.
Since certain changes in carrying out the above 45
process and in the constructions set forth, which
embody the invention may be made without de
parting from its scope, it is intended that all mat
ter contained in the above description or shown
in the accompanying drawing shall be interpreted 50
as illustrative and not in alimiting sense.
It is also to be understood that the following
claim is intended to cover all of the generic
and speciñc features of the invention herein de
scribed, and all statements of the scope of the 55
2,1 16,244
invention which, as a matter- of language, might
be said to fall therebetween.
Having described my invention, what I claim
as new and desire to secure by Letters Patent, is:
A getter for radio tubes and the like having an
outer envelope of metal comprising a strip of
metal having a general contour of a portion of
the interior of said envelope and having imbedded
therein upon the outer surface thereof a pellet
of getter material whereby when said metal is
attached to the inner face of a. radio tube envelopeI
the getter material will be in Contact with the 5
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