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Патент USA US3037127

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May 29, 1962
D. R. TELSON
3,037,117
FILM DEVELOPING ENVELOPE
Filéd Nov. 15, 1959
INVENTOR.
DAVID R. TELSON.
BY
%MQ
ATTORNEY
United States Pater
rice
1
3,03 7,1 17
Patented May 29, 1962
2
FIGURE 4 is a front view of another embodiment of
3,037,117
my invention, with fragments broken away for clarity.
FILM DEVELOPING ENVELOPE
FIGURE 5 is a section of FIG. 4 taken along line
5-5.
FIGURE 6 is a front view of the envelope of another
embodiment of my invention, a fragment being removed
and a portion of the envelope shown torn and folded
back for purposes of clarity.
FIGURE 7 is a section of FIG. 6 taken along line
David R. Telson, 950 Ocean Ave., Brooklyn 26, N.Y.
Filed Nov. 13, 1959, Ser. No. 852,699
6 Claims. (Cl. 250-68)
This invention relates to ?lm packages, and is partic
ularly, although not exclusively, directed to envelopes
containing X-ray ?lms for daylight development.
Various expedients have heretofore been employed 10 7—7, showing a ?lm operatively in place, a fragment
being shown enlarged for clarity.
for the development of ?lms in daylight, so as to elimi
nate the obvious dif?culties and inconveniences inherent
The various embodiments of my invention illustrated
in conventional darkroom techniques. Such expedients
represent ?lm packages especially adapted for X-ray
generally involve the use of relatively complex and costly
purposes. Each contains an outer envelope—the ?lm
developing tanks, most of these requiring loading in the 15 container—that is water permeable and transparent to
dark. Where special cameras are employed, such as the
“Polaroid” cameras for X-rays, the costs are frequently
X—rays, and also contains barrier means for separating
the ?lm from the adjacent inner surfaces of the envelope,
as will more clearly hereinafter appear. It is preferred
that the said envelope be made of black ?lter paper, and
that the barrier means be made of plastic material that is
transparent to X-rays but that permits the passage there
through of water.
In the form of my invention illustrated in FIGS. 1 to
3, the outer envelope or container 10, made of water
prohibitive; and furthermore, the emulsion speed of the
?lm is such as to reqiure what in the opinion of many are
unduly long exposure periods. In the case of large ?lms,
and particularly X-ray ?lms for relatively large areas,
the almost invariable practice-where de?nition is re
quired—is to employ suitably-sized developing, ?xing
and washing tanks in light-sealed rooms.
During cer
tain surgical operations where X-ray determinations must 25 permeable and X-ray transparent material, contains the
be made during the progress of the operation, it is a
?ap 11 which, when operatively closed, completely seals
matter of critical importance that the ?lm be processed as
the interior of the envelope. The barrier means in this
close as possible to the locale of operation~—a condition
form of my invention comprises ‘the folded sheet of
which very often is not met under existing hospital ar
screening 12, comprising the opposite panels 13 and 14
rangements.
joined at the lateral fold 15. It is preferred that sheet
It is the primary object of my invention to provide
12 be made of a plastic material, like vinyl coated ?bre
a means of making special type ?lms—such as X-ray
glass or other material transparent to X-r-ays and not
?lms or those sensitized to radiations or energy rays of
chemically affected by conventional developing and ?xing
selected frequencies like infra-red rays—to be processed
solutions.
The screening sheet 12 consists of a mesh
in daylight by conventional developing techniques, and 35 work of ?ber elements sufficiently spaced so as to permit
by using open developing tanks. And in this aspect of
the free passage therethrough of water and the develop
ing and ?xing solutions.
my invention, it my further objective to obviate the use
of such ?lms or techniques that require unduly long
In the operation of this device, a ?lm 16 is positioned
exposures.
In the accomplishment of the above-mentioned objec
tives, I employ a novel water permeable envelope com
pletely encasing the ?lm, the material of the envelope be
ing transparent to a selected type of ray or radition fre
40
between the panels 13 and 14 of the barrier member 12,
the assembled ?lm and barrier member being positioned
within compartment 17 of the envelope 10. When the
flap 11 is operatively closed, the entire package is in
condition to be operatively exposed to X-rays, in the
manner in which conventionally sealed X-ray ?lms are
quency, but opaque to the visible portion of the spectrum.
The components of the invention are such as to enable 45 exposed. Inasmuch as the material of the envelope 10
and of the barrier member 12 are transparent to X-rays,
the encased ?lm to be operatively exposed to the action
of the rays, and further to permit the fully enveloped ex
as aforesaid, every portion of the ?lm emulsion is fully
exposed to the action of the X-rays.
posed ?lm to be immersed in an open developing tank,
The package, including the exposed ?lm, is then im
whereby the developing solution will penetrate the en
velope and engage the ?lm emulsion for full developing 50 mersed in an open ‘developing tank. Due to the fact that
the material of envelope 10 is water permeable, the de
action. The subsequent steps of Washing and ?xing can
veloping solution will pass through the envelope and
be accomplished in the same manner without removing
the envelope.
through the meshes of panels 13 and 14, to contact the
?lm emulsion. Although the said panels 13 and 14 of
In accordance with another object of my invention,
means are provided to keep the ?lm from adhering to the 55 the barrier member obviously permit the passage there
through of the developing ?uid, they keep the ?lm spaced
inner surface of the envelope, thereby obviating the pos
from the inner surfaces 18 and 19 of the said envelope
sibility of incomplete or faulty development of areas of
the ?lm.
10, thereby preventing any adhesion of the said surfaces
with the adjacent surfaces of the ?lm. The barrier mem
It is my further object to provide a simple, inexpen
sive, compact, readily fabricated and easily assembled 60 ber 12 and ?lm 16 are not in tight pressing engagement
device having the features aforesaid.
with each other, nor are the said panels 13 and 14 in
Other objects, features and advantages will appear
tight pressing engagement with the inner surfaces 18 and
from the drawings and the description hereinafter given.
Referring to the drawings,
19 of the envelope. Accordingly, the developing solu
tion will be able to reach the entire emulsion surface of
FIGURE 1 is a disassembled perspective view of the 65 the ?lm, to produce a clear image after full develop
three components constituting one embodiment of my
ment. The washing and ?xing operations are performed
invention.
in similar manner, also in open tanks.
FIGURE 2 is a front elevation of the assembled com
In the form of my invention illustrated in FIGS. 4
bination of the components shown in FIG. 1, portions
and 5, I employ a water permeable container 20, a ?lm
being broken away for clarity.
70 21, and a barrier member 22 of screening material like
FIGURE 3 is a section of FIG. 2 taken along line
that above described. In addition, there is a second
3-3.
barrier member 23 consisting of a folded sheet of limp
3,037,117
3
water-pervious material, such as cheese cloth. It has
been found that by the use of the screen barrier 22 and
the limp barrier 23, with the latter positioned adjacent
to the inner surfaces of the envelope, complete exposure
can be had with additional assurance that the ?lm 21 will
not come in contact and adhere to the inner surfaces of
the envelope. It is, of course, understood that the mate
rial of the second barrier 23 permits the passage there
through of water, and is made of an X-ray transparent
10
substance.
In the embodiment of my invention illustrated in FIGS.
6 and 7, an envelope 24 is used, also made of water
permeable, X-ray transparent material. The inner sur
faces 25 and 26 of the envelope are, however, coated
with separated particles 27 of X-ray transparent material,
such as Bakelite. Said particles are applied in any man
ner known to those skilled in the art, such as by spray
A
said barrier means comprising a plurality of spaced ele
ments to permit the operative passage of developing liquid
therebetween, the material of said container and said
barrier means being transparent to said form of radiation.
2. In a daylight development X-ray ?lm package, an
X-ray ?lm, a container completely enveloping said ?lm,
and barrier means within said container disposed between
the interior surface of said container and said ?lm and
substantially coextensive with said ?lm and protecting
said ?lm from adhering to the interior surface of said
container; the material of said container being opaque
to light, said barrier means comprising a plurality of
spaced elements to permit the operative passage of de
veloping liquid therebetween, the material of said con
tainer and said barrier means being transparent to X-rays.
3. In a daylight development X-ray ?lm package, the
combination according to claim 2, said barrier means
comprising a folded sheet of screening with two opposing
panels ?anking said ?lm and separating it from the walls
of said container.
4. In a daylight development X-ray ?lm package, the
combination according to claim 2, said barrier means
comprising a folded sheet of screening with two opposing
panels ?anking said ?lm and a second folded sheet of
ing or painting said inner surfaces with a liquid vehicle
containing said particles 27. It will be noted that be
cause there are spaces 28 between said particles, the de
veloping solution will be able to pass therebetween to
engage ?lm 29. However, since the said particles 27
extend inwardly from the said surfaces 25 and 26 of the
envelope 24, it is apparent that the ?lm 29 will be kept
from engaging and adhering to the said surfaces 25 and 25 limpwater-pervious X-ray transparent material envelop
ing said panels and separating them from the walls of
26. It is thus evident that the package consisting of the
said container.
envelope 24 and the ?lm 29 can be operatively exposed
5. In a daylight development X-ray ?lm package, the
and developed in the manner aforesaid in daylight, to
combination according to claim 2, said barrier means
obtain fully developed and clear images.
comprising a plurality of spaced particles of X~ray trans
It is, of course, understood that the outer envelopes
parent material on an inner wall portion of said con
in the various embodiments of my invention are opaque
tainer.
to light, so that when the envelope is completely sealed,
6. The package of claim 1 in which the barrier means
the ?lm therein will be in complete darkness.
comprises a screen of plastic material.
In the above description, the invention has been dis
closed merely by way of example and in preferred man
References Cited in the ?le of this patent
ner; but obviously many variations and modi?cations
may be made therein. It is to be understood, ‘therefore,
UNITED STATES PATENTS
that the invention is not limited to any speci?c form or
manner of practicing same, except insofar as such limita
tions are speci?ed in the appended claims.
40
I claim:
1. In a daylight development ?lm package, a ?lm sensi
tive to a selected form of radiation, a container com
pletely enveloping said ?lm, and barrier means within said
container disposed between the interior surface of said
container and said ?lm and substantially coextensive
with said ?lm and protecting said ?lm from adhering to
the interior surface of said container; the material of
said container being water permeable and opaque to light,
1,352,615
1,879,498
2,566,266
MacLagan __________ __ Sept. 14, 1920
Richards ____________ __ Sept. 27, 1932
Uhle ________________ __ Aug. 28, 1951
2,624,011
2,796,526
2,802,950
Stern _______________ __ Dec. 30, 1952
Lusebrink ___________ .__ June 18, 1957
Gordon _____________ __ Aug. 13, 1957
2,894,141
vKollock ____________ __ July 7, 1959
581,607
Great Britain ________ __ Oct. 18, 1946
FOREIGN PATENTS
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