US2902367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer antioxidant
Assignee: GAF Chemicals Corp
•
Filing: 1957-12-26
•
Granted: 1959-09-01
•
Expires: 1977-12-26
Abstract
No abstract record available.
Inventors
- 👤 Laurence G Welliver
- 👤 Jerry S Krizka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/58; C07D263/02; C07D263/30; C07D263/34; C07D263/46; C07D277/00; C07D277/60; C07D277/62; C07D277/68; C07D277/70; C07D277/74; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A PHOTOGRAPHIC DEVELOPER SOLUTION STABILIZED AGAINST AERIAL OXIDATION CONTAINING AS ITS ESSENTIAL INGREDIENTS FOR ONE LITER OF DEVELOPER SOLUTION:
Claim 2
Dependent Claim
19 words
A PHOTOGRAPHIC DEVELOPER SOLUTION STABILIZED AGAINST AERIAL OXIDATION CONTAINING AS ITS ESSENTIAL INGREDIENTS FOR ONE LITER OF DEVELOPER SOLUTION:
References Cited (Backward Citations)
US2313523A
Cited
GB643411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |