US2496903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer containing a negatively substituted aralkylamine and process of development
Assignee: GAF Chemicals Corp
•
Filing: 1947-11-18
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Granted: 1950-02-07
•
Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 William L Wasley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:39
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER FOR SILVER-HALIDE COMPRISING A SILVER-HALDIE DEVELOPER AND A NEGATIVELY SUBSTITUATED ARALKYLAMINE SELECTED FROM THE CLASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
27 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER FOR SILVER-HALIDE COMPRISING A SILVER-HALDIE DEVELOPER AND A NEGATIVELY SUBSTITUATED ARALKYLAMINE SELECTED FROM THE CLASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
References Cited (Backward Citations)
US2410644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |