US2515147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer containing an aralkylamine and process of development
Assignee: GAF Chemicals Corp
•
Filing: 1947-08-26
•
Granted: 1950-07-11
•
Expires: 1967-08-26
Abstract
No abstract record available.
Inventors
- 👤 William L Wasley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:37
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER FOR SILVER HALIDE EMULSIONS COMPRISING AN AQUEOUS SOLUTION OF A SILVER HALIDE DEVELOPING AGENT, AN INORGANIC ALKALI AND AN ARALKYLAMINE SELECTED FROM THE CLASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
36 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER FOR SILVER HALIDE EMULSIONS COMPRISING AN AQUEOUS SOLUTION OF A SILVER HALIDE DEVELOPING AGENT, AN INORGANIC ALKALI AND AN ARALKYLAMINE SELECTED FROM THE CLASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
References Cited (Backward Citations)
US2371740A
Cited
US2410644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-10 | 1954-01-09 | 1954-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-10 | 1958-01-09 | 1958-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-10 | 1962-01-09 | 1962-07-11 | $7700.00 | Window Closed / Lapsed |