US3652282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film unit and method of manufacture
Assignee: Polaroid Corp
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Filing: 1969-03-06
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Granted: 1972-03-28
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Expires: 1989-03-06
Abstract
Abstract A self-developing, photosensitive film unit including a multilayer photosensitive element and a transparent imagerecording element laminated to one another during manufacture and a rupturable container of processing liquid attached to the elements at one end for dispensing its liquid contents between the elements, and adapted to be processed by passing the film unit including the container and laminated elements between a pair of pressure-applying members. The film unit is formed by laminating a photosensitive element to an image-receiving element by applying a layer of a film-forming agent to one of the elements, superposing the elements and distributing a layer of a second film-forming material therebetween to form an adhesive bond that is weaker than the bond between any other layers of said film unit and is adapted to rupture readily during the spreading of a processing liquid between the elements. A binding is secured around at least two sides of the laminate and a container of processing liquid is attached to one edge of the sandwich in position to eject its contents between the elements in response to the application of compressive pressure.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:25
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; B32B23/00; B32B23/04; B32B23/08; B32B27/00; B32B27/30; B32B27/306; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/70; B32B2307/716; B32B2307/7166; B32B2317/00; B32B2317/18; B32B2329/00; B32B2329/04; B32B2331/00; B32B2331/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
41 words
A photographic film unit as defined in claim 1 wherein said emulsion layer has associated therewith a dye image-forming material which is soluble and diffusible in alkali and said image-receiving layer includes a polymeric material dyeable by said dye image-forming material.
Claim 2
Dependent Claim
32 words
A photographic film unit as defined in claim 2 wherein said emulsion layer includes a strata of a hardened gelatin and said polymer of said intermediate layer is cellulose acetate hydrogen phthalate.
Claim 3
Dependent Claim
20 words
A photographic film unit as defined in claim 3 wherein said polymer of said second intermediate layer is hydroxypropyl cellulose.
Claim 4
Dependent Claim
49 words
A photographic film unit as defined in claim 1 wherein said elements are rectangular and said binding means include means secured to the outer surfaces of said elements at the other edges thereof for retaining said elements in superposition and preventing escape of said liquid from between said elements.
Claim 5
Dependent Claim
33 words
A photographic film unit as defined in claim 1 wherein said first layer is formed of a polymer selected from the class consisting of cellulose acetate hydrogen phthalate, hydroxyethyl methacrylate and vinyl acetate.
Claim 6
Dependent Claim
20 words
A photographic film unit as defined in claim 6 wherein said polymer of said second intermediate layer is hydroxypropyl cellulose.
Claim 7
Dependent Claim
36 words
A photographic film unit as defined in claim 6 wherein said processing liquid includes a viscous polymeric film-forming material adapted, when distributed in a thin layer between said elements, to adhere said elements to one another.
Claim 8
Dependent Claim
26 words
A photographic film unit as defined in claim 1 wherein said intermediate layer is adhered between and to said image-receiving layer and said second intermediate layer.
Claim 9
Dependent Claim
186 words
In a photographic film unit adapted, following exposure, to be processed by distributing a liquid processing composition within said film unit, said film unit comprising a photosensitive element comprising a first support layer and at least a photosensitive layer on said support layer including a photosensitive, image-recording material suspended in a supporting medium at least permeable to said liquid processing composition, and a second element including a second support layer and at least a second layer on said second support layer permeable to said liquid processing composition, said elements being arranged in face-to-face relation with said photosensitive and second layers between said support layers, and one of said elements being light transmitting to permIt exposure of said photosensitive layer through the light transmitting element, the improvement comprising: at least an intermediate layer between the facing surfaces of the photosensitive and second elements adhering said elements to one another over the major portion of said facing surfaces, said intermediate layer including a water soluble polymeric film-forming material forming an adhesive bond between said facing surfaces weaker than the bond between any other layers of said film unit.
Claim 10
Dependent Claim
25 words
A photographic film unit as defined in claim 10 wherein said supporting medium for said image-recording material and said second layer include water soluble polymers.
Claim 11
Dependent Claim
27 words
A photographic film unit as defined in claim 10 wherein said photosensitive layer includes at least a plurality of strata comprising differently sensitized gelatino silver halide emulsions.
Claim 12
Dependent Claim
18 words
A photographic film unit as defined in claim 12 wherein said second layer includes a water soluble polymer.
Claim 13
Dependent Claim
16 words
A photographic film unit as defined in claim 13 wherein said second layer includes polyvinyl alcohol.
Claim 14
Dependent Claim
82 words
A photographic film unit as defined in claim 10 including a rupturable container of a liquid processing composition coupled to said elements adjacent one end edge of one of said elements exterior of said region between elements by means secured to said container and said elements for conducting said liquid from said container between said elements at said one edge of said one element, said elements being unlaminated in a narrow transverse region at said one end edge of said one element.
Claim 15
Dependent Claim
31 words
A photographic film unit as defined in claim 10 including binding means secured to at least the lateral margins of said elements for retaining said elements together at their lateral edges.
References Cited (Backward Citations)
US2543181A
Cited
US3415644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |