Patent US2563469A successfully refreshed from Google Patents.
US2563469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive elements for color photography
Assignee: EIDP Inc
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Filing: 1947-02-18
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Granted: 1951-08-07
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Expires: 1967-02-18
Abstract
No abstract record available.
Inventors
- 👤 Jennings Andrew Bradshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/7614; G03C5/00; G03C5/26; G03C5/29; G03C5/315; G03C7/00; G03C7/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT, A GELATIN SILVER HALIDE EMULSION LAYER ON SAID SUPPORT WHICH LAYER HAS FINELY DIVIDED SOLID INERT PIGMENT PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF 1.0 TO 0.1 MICRON UNIFORMLY DISPERSED THERETHROUGH AND HAS SUPERIMPOSED THEREON A LAYER COMPOSED OF A WATER-SOLUBLE O-SULFOBENZALDEHYDE ACETAL OF POLYVINYL ALCOHOL SAID ACETAL BEING INSOLUBLE IN ALKALINE PHOTOGRAPHIC DEVELOPER SOLUTIONS CONTAINING 2% BY WEIGHT OF DISSOLVED INORGANIC SALTS.
Claim 2
Dependent Claim
69 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT, A GELATIN SILVER HALIDE EMULSION LAYER ON SAID SUPPORT WHICH LAYER HAS FINELY DIVIDED SOLID INERT PIGMENT PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF 1.0 TO 0.1 MICRON UNIFORMLY DISPERSED THERETHROUGH AND HAS SUPERIMPOSED THEREON A LAYER COMPOSED OF A WATER-SOLUBLE O-SULFOBENZALDEHYDE ACETAL OF POLYVINYL ALCOHOL SAID ACETAL BEING INSOLUBLE IN ALKALINE PHOTOGRAPHIC DEVELOPER SOLUTIONS CONTAINING 2% BY WEIGHT OF DISSOLVED INORGANIC SALTS.
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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) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |