US2954292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic desensitising compounds
Assignee: Ilford Imaging UK Ltd
•
Filing: 1958-09-29
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Granted: 1960-09-27
•
Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Duffin George Frank
- 👤 Kendall John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:27
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; C09B23/105; G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48515; G03C1/48523
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A DIRECT POSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A GELATINO SILVER HALIDE EMULSION OF WHICH THE SILVER HALIDE CONSISTS ESSENTIALLY OF SILVER CHLORIDE AND WHICH IS FOGGED SO THAT ON PHOTOGRAPHIC DEVELOPMENT IT IS UNIFORMLY RENDERED A SOLID BLACK, SAID EMULSION CONTAINING A DESENSITISING COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
47 words
A DIRECT POSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A GELATINO SILVER HALIDE EMULSION OF WHICH THE SILVER HALIDE CONSISTS ESSENTIALLY OF SILVER CHLORIDE AND WHICH IS FOGGED SO THAT ON PHOTOGRAPHIC DEVELOPMENT IT IS UNIFORMLY RENDERED A SOLID BLACK, SAID EMULSION CONTAINING A DESENSITISING COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2265907A
Cited
US2541472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |