US3778267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer
Assignee: United States Department of the Air Force
•
Filing: 1971-10-14
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Granted: 1973-12-11
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Expires: 1991-10-14
Abstract
Abstract A photographic developer for achieving maximum film sensitivity by increasing the dynamic range of a photographic film which includes an additive mixture of N-(p-hydroxyphenyl glycin) and 1phenyl-3-pyrazolidone.
Inventors
- 👤 S Braunstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:52
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; Y; Y10; Y10S; Y10S430/00; Y10S430/129
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB761301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |