Patent US496874A successfully refreshed from Google Patents.
Patent US2976147A successfully refreshed from Google Patents.
US2976147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic stripping film
Assignee: EIDP Inc
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Filing: 1958-08-07
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Granted: 1961-03-21
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Expires: 1978-08-07
Abstract
No abstract record available.
Inventors
- 👤 Alles Francis Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PHOTOGRAPHIC STRIPPING FILM COMPRISING A HYDROPHOBIC FILM BASE HAVING ON ONE SURFACE COATED IN ORDER WITH A WATER-PERMIABLE COLLOID LAYER, A STRIPPING LAYER COMPRISING AN AQUEOUS COMPOSITION HAVING AS ESSENTIAL INGREDENTS (1) GELATIN AND (2) A WATER SOLUBLE POLYMER OF AT LEAST 80% N-VINYLLACTAM UNITS SELECTED FROM THE GROUP CONSISTING OF N-VINYL-2-PYRROLIDONE, N-VINYL-2PIPERIDONE, N - VINYL-2-PYRROLIDONE/N-VINYL-EPSILON-CAPROLACTAM, N-VINYLOXAZOLIDONE, N-VINYLVALEROLACTAM, AND N-VINYL-5-METHYL-2-PYRROLIDONE, THE BALANCE OF THE POLYMERIC UNITS CONSISTING OF UNITS OF A VINYLIDENE MONOMER CONTAINING A SINGLE CARBON TO CARBON UNSATURATION, SAID INGREDIENTS BEING PRESENT IN SAID COMPOSITION IN A RATIO OF FROM 3 TO 15 PARTS BY WEIGHT OF GELATIN FOR EACH PART OF INGREDIENT (2), AND A GELATINO SILVER HALIDE EMULSION LAYER, SAID POLYMER BEING SOLUBLE FROM ABOUT 4% TO ABOUT 40% IN WATER.
Claim 2
Dependent Claim
126 words
A PHOTOGRAPHIC STRIPPING FILM COMPRISING A HYDROPHOBIC FILM BASE HAVING ON ONE SURFACE COATED IN ORDER WITH A WATER-PERMIABLE COLLOID LAYER, A STRIPPING LAYER COMPRISING AN AQUEOUS COMPOSITION HAVING AS ESSENTIAL INGREDENTS (1) GELATIN AND (2) A WATER SOLUBLE POLYMER OF AT LEAST 80% N-VINYLLACTAM UNITS SELECTED FROM THE GROUP CONSISTING OF N-VINYL-2-PYRROLIDONE, N-VINYL-2PIPERIDONE, N - VINYL-2-PYRROLIDONE/N-VINYL-EPSILON-CAPROLACTAM, N-VINYLOXAZOLIDONE, N-VINYLVALEROLACTAM, AND N-VINYL-5-METHYL-2-PYRROLIDONE, THE BALANCE OF THE POLYMERIC UNITS CONSISTING OF UNITS OF A VINYLIDENE MONOMER CONTAINING A SINGLE CARBON TO CARBON UNSATURATION, SAID INGREDIENTS BEING PRESENT IN SAID COMPOSITION IN A RATIO OF FROM 3 TO 15 PARTS BY WEIGHT OF GELATIN FOR EACH PART OF INGREDIENT (2), AND A GELATINO SILVER HALIDE EMULSION LAYER, SAID POLYMER BEING SOLUBLE FROM ABOUT 4% TO ABOUT 40% IN WATER.
References Cited (Backward Citations)
US2626858A
Cited
GB687751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |