Patent US4213847A successfully refreshed from Google Patents.
US2609291A
Expired / Lapsed
US
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Photographic multilayer stripping films
Assignee: Dufay Chromex Ltd
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Filing: 1948-11-26
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Granted: 1952-09-02
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Expires: 1968-11-26
Abstract
No abstract record available.
Inventors
- 👤 Coote Jack Howard
- 👤 Gathercole William Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A MULTI-LAYER STRIPPING FILM COMPRISING A SUPPORT CARRYING UPON ONE SIDE THEREOF AT LEAST TWO SILVER HALIDE EMULSION LAYERS SENSITIVE TO DIFFERENT PARTS OF THE SPECTRUM, SAID LAYERS BEING SEPARATED BY A LAYER COMPRISING A TRANSPARENT, FLEXIBLE, WATER-INSOLUBLE, HYDROPHOBE COPOLYMER OF VINYL CHLORIDE AND VINYL ACETATE AND CONTAINING AT LEAST 85% OF VINYL CHLORIDE, THE SILVER HALIDE EMULSION LAYER UNDERLYING SAID COPOLYMER LAYER ADHERING DIRECTLY TO SAID COPOLYMER LAYER AND THE SILVER HALIDE EMULSION LAYER OVERLYING SAID COPOLYMER LAYER BEING ATTACHED HERETO BY A HARDENED GELATINE LAYER.
Claim 2
Dependent Claim
87 words
A MULTI-LAYER STRIPPING FILM COMPRISING A SUPPORT CARRYING UPON ONE SIDE THEREOF AT LEAST TWO SILVER HALIDE EMULSION LAYERS SENSITIVE TO DIFFERENT PARTS OF THE SPECTRUM, SAID LAYERS BEING SEPARATED BY A LAYER COMPRISING A TRANSPARENT, FLEXIBLE, WATER-INSOLUBLE, HYDROPHOBE COPOLYMER OF VINYL CHLORIDE AND VINYL ACETATE AND CONTAINING AT LEAST 85% OF VINYL CHLORIDE, THE SILVER HALIDE EMULSION LAYER UNDERLYING SAID COPOLYMER LAYER ADHERING DIRECTLY TO SAID COPOLYMER LAYER AND THE SILVER HALIDE EMULSION LAYER OVERLYING SAID COPOLYMER LAYER BEING ATTACHED HERETO BY A HARDENED GELATINE LAYER.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |