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Патент USA US2409977

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' Oct. 22, 1946..
Filed July 13, 1945
Patented Oct. 22, ‘1946
David Dean, Rochester, N. ‘Y., assignor to East
man Kodak Company, Rochester, N. 131;, acor
poration of New Jersey
' Application July 13, 1945,‘ Serial No. 604,761
3 Claims. ((31. 95-2)
This invention relates to photography and par
ticularly. to a method for‘ masking color trans
mount thereby provides a recessed portion ‘ as
shown at [2 so that the edges of the mount extend
through the central opening in the mount. The
Photographic color transparencies are fre
quently mounted in cardboard, synthetic plastic
or metal mounts having a central opening so that
the transparency may be viewed in a still pro
jector or viewer While contained in the mount.
above and beyond the transparency [0.
As shown in Fig. 2, the masking means ‘of my‘
invention consists in the use of registration
patches I3 of transparent material such as clear
acetate sheeting about 0.015 inch thick. ‘ .These
The central opening inthe mount provides a
registration patches are of substantially the exact
recess so that the transparency lies below the 10 size as the central opening in the mount H so
outer surface of the mount.
that they just ?t in the recessed portion l2 of
In making prints or duplicates‘ of-the trans
the mount. The patches I3 are cemented to the
parency, it is desirable to use a mask having an
back of a photographic ?lm such as an unper
image thereon for correction of the color and
tone of the original image. ‘Thismask must be
registered with the color image during the print
ing exposure. This necessitates removing the
transparency from the mount with the attend
ant disadvantages of expense and possible dam
forated‘ 35-min. ?lm having sensitive layer 15'
on the opposite side thereof.- The masking ?lm
l4 may be of any suitable dimensions and may
be perforated if desired. Other layers customary
in the art such as subbing and overcoating layers
may also be present.
age to the transparency, or providing some means
For the masking exposure, and as shown in Fig.
for registering the masking ?lm with the trans
parency while in the mount. Such registering
3, the transparency in its mount is centered in the
exposing gate of suitable exposure apparatus and
the registration patch [3 of the masking ?lm is
means are not readily available or have not proven
successful in practice.
It is therefore an object of the present inven
tion to provide a simple and inexpensive tech
placed in the central opening of the mount. With
the ?lms in this position an exposure is made with
light passing through the color transparency onto
nique for masking a color transparency while
the emulsion of the masking ?lm. The mounting
retained in its mount. Other‘objects will'appear
transparency is then removed from the masking
from the following description of my invention.
?lm which is developed, ?xed, washed and dried
The principal object and other objects of the 30 in the usual manner.
invention are accomplished by providing a reg
The masks are then returned to their position
istration patch of substantially the exact size
on the transparency. The registration patch I3
permits exact registration of the masking image
of the opening in the mount, one side of the
patch being in contact with a light-sensitive ma
in layer [5 with the color transparency I0. While
terial, and exposing the light-sensitive material
in this position the mask and the original trans
While the patch is registered in the opening in
parency are in register and are then printed in
the mount. This permits processing of the sen
combination onto the printing or duplicating ma
sitive material and re-registration if necessary
terial. After printing the mask may be discarded
in the opening in the mount so that the printing
or it may be cut from the masking ?lm‘ together
exposure may be made with the masking image 40 with the corresponding registration patch and re
in register with the original transparency.
tained with the transparency for further use if
In the accompanying drawing,
Fig. 1 is a perspective view of a color trans
The masking exposure may be made in any
parency in its mount and Fig. 2 is a perspective
suitable way with light of various colors suitable
view of a portion of the masking material used 45 for masking, all as well known in the art.
according to my invention. Fig. 3 is a cross
It is also possible to punch the registration
section view of the combined color transparency
patch from a piece of sensitive transparent ?lm
and masking material.
and to mount this ?lm directly in the opening in
Fig. 1 shows a color transparency such as a
the mount, with the emulsion outermost or away
multi-color transparency on 35-mm. ?lm as it is 50 from the transparency. Prior to mounting the
usually mounted for viewing in a projector.
sensitive registration patch in the opening of the
The mounted transparency consists of the pic
ture or transparency It] in the mount H, which
is generally two pieces of cardboard cemented
together so that the transparency may be viewed 55
transparency mount, the emulsion is placed in
a solution of developing agent so that developer
is introduced into the unexposed emulsion. The
patch is then registered in the opening in the
mount and is exposed in the usual way through
- opening through which the transparency may be
the transparency. The exposed emulsion is then
viewed, the, edges of ‘the mount projecting beyond
developed by treatment with alkaline vapors such '
and above the transparency, which ' comprises
- as ammonia and the developing action stopped by ~ ' providing a transparent, rigid patch of substan- '
treatment with an acid vapor such as acetic acid
vapor. This avoids removal of the registration
patch and the emulsion from the mount for de
velopment of the masking image. The printing
exposure may then be made without removing
the mask from the transparency mount. Devel-'
opment of an emulsion by vaportreatment is
- described in Fierke and Stand U. S. patent applie
cation Ser. No. ‘500,923, ?led September 2, 1943,
and in Yackel, Leermakers and Stand U. S. pat
ent application Ser. No. 500,924, ‘?led September _
2, 1943, now Patent No. 2,388,894.
It will be understood that my invention is sus-j
ceptible of variations not herein speci?cally de
scribed and that the scope of my invention is co
tially the exact ‘size as the opening in said mount,
securing said transparent patch to the back of a
transparent, sensitive photographic ?lm at least
as‘ large as the opening in said mount, register
ing said patch in the opening in said mount,
exposing said sensitive material through said
transparency with the patch in registration, re
moving said exposed material from said trans
parency and developing an image therein, again
registering said patch ‘in said transparency’
mount, and exposing the combination of trans
parency and" developed image onto a print
3. The method-of masking a multi-color trans
parency ‘secured in a mount having a central
extensive with the scope of the appended claims. 20 opening through which the transparency may be
I claim:
~ 1. The; method of masking'a multi-color trans
parency secured in a mount having a central
viewed, the edges‘of ‘themount projecting be
yond and abovefthe transparency, which com-_
prises providing a transparent cellulose ester
patch of substantially the exact size as the open
opening through which the transparency may be
viewed, the edges of the mount. projecting beyond 25 ing in said mount, securing said ‘transparent
and. above ' the transparency, which comprises
patch to- the back ofv a transparent photographic‘
providing a transparent, rigid patch of substan
tially the :exact size as the opening in said
?lm ‘at, least as, large as the opening in said
mount, one side of said patch being in contact
mount ‘and having 'a silver halide emulsion on
the opposite side thereof, registering said patch in
with a light-sensitive layer, registering said patch 30 the opening in said mount, exposing said emul-y
in the opening in said mount with the sensitive
side outermost, exposing said light-sensitive layer
through said'transparency, and thereafter form- -
ing a masking image-therein ‘and exposing the
sion through said transparency with they patch in
registration, removing said exposed material‘
fromv said transparencyrand developing a silver
image therein, again registering said ‘patch in
combination of‘ transparency and masking image 35 said transparency mount and exposinglthe com
bination of transparency and developed image
onto aprint material‘,
2. The‘method of masking a multi-color trans
parency secured in a mount having a central
onto a multi-layer print material.
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