US3252801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions, layers and elements
Assignee: EIDP Inc
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Filing: 1961-07-10
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Granted: 1966-05-24
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Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 Cohen Abraham Bernard
- 👤 Shacklett Comer Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/109; Y10S430/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PHOTOGRAPHIC GELATINO-SILVER HALIDE EMULSION COMPRISING (1) AN AQUEOUS PHASE CONTAINING THEREIN AS A PART OF SAID PHASE (A) GELATIN AND (B) A WATER-SOLUBLE POLYVINYL PRRROLIDONE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 8,000 AND (2) A DISPERSION THEREIN OF WATER-DISPERSIBLE COLLOIDAL PARTICLES OF A SUBSTANTIALLY WATER-INSOLUBLE VINYL ADDITION POLYMER OF AN ETHYLENICALLY UNSATURATED MONOMER OF MOLECULAR WEIGHT LESS THAN 250, SAID GELATIN, POLYVINYL PYRROLIDONE AND WATER-INSOLUBLE POLYMER BEING PRESENT IN THE PERCENTAGES BY WEIGHT FROM 30% TO 80%, 6% TO 30% AND 10% TO 55%, RESPECTIVELY, OF THE TOTAL WEIGHT OF THE THREE POLYMERIC BINDERS.
Claim 2
Dependent Claim
97 words
A PHOTOGRAPHIC GELATINO-SILVER HALIDE EMULSION COMPRISING (1) AN AQUEOUS PHASE CONTAINING THEREIN AS A PART OF SAID PHASE (A) GELATIN AND (B) A WATER-SOLUBLE POLYVINYL PRRROLIDONE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 8,000 AND (2) A DISPERSION THEREIN OF WATER-DISPERSIBLE COLLOIDAL PARTICLES OF A SUBSTANTIALLY WATER-INSOLUBLE VINYL ADDITION POLYMER OF AN ETHYLENICALLY UNSATURATED MONOMER OF MOLECULAR WEIGHT LESS THAN 250, SAID GELATIN, POLYVINYL PYRROLIDONE AND WATER-INSOLUBLE POLYMER BEING PRESENT IN THE PERCENTAGES BY WEIGHT FROM 30% TO 80%, 6% TO 30% AND 10% TO 55%, RESPECTIVELY, OF THE TOTAL WEIGHT OF THE THREE POLYMERIC BINDERS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |