Patent US2575182A successfully refreshed from Google Patents.
US2575182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsions and developers containing 5-acyloxypyrazole color formers
Assignee: EIDP Inc
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Filing: 1946-08-21
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Granted: 1951-11-13
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Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 Martin Elmore Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A COLLOID SILVER HALIDE EMULSION HAVING ADDED THERETO A COLOR FORMER HAVING THE GENREAL FORMULA
Claim 2
Dependent Claim
15 words
A COLLOID SILVER HALIDE EMULSION HAVING ADDED THERETO A COLOR FORMER HAVING THE GENREAL FORMULA
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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |