US2860976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifoggants for photographic developers
Assignee: Eastman Kodak Co
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Filing: 1956-08-03
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Granted: 1958-11-18
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Expires: 1976-08-03
Abstract
No abstract record available.
Inventors
- 👤 Catherine M Spath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PHOTOGRAPHIC DEVELOPER HAVING A REDUCED TENDENCY TO FOG PHOTOGRAPHIC SILVER HALIDE EMULSIONS COMPRISING AN ALKALINE SOLUTION OF (1) A SILVER HALIDE DEVELOPING AGENT SELECTED FROM THE GROUP CONSISTING OF POLYHYDROXYBENZENES, N-MONOALKYLAMINORPHENOLS, AND MIXTURES OF SAID POLYHYDROXYBENZENES AND N-MONOALKYLAMINOPHENOLS AND AT LEAST 10 MG. PER LITER OF SOLUTION OF (2) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
66 words
A PHOTOGRAPHIC DEVELOPER HAVING A REDUCED TENDENCY TO FOG PHOTOGRAPHIC SILVER HALIDE EMULSIONS COMPRISING AN ALKALINE SOLUTION OF (1) A SILVER HALIDE DEVELOPING AGENT SELECTED FROM THE GROUP CONSISTING OF POLYHYDROXYBENZENES, N-MONOALKYLAMINORPHENOLS, AND MIXTURES OF SAID POLYHYDROXYBENZENES AND N-MONOALKYLAMINOPHENOLS AND AT LEAST 10 MG. PER LITER OF SOLUTION OF (2) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2099374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |