US2691589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer compositions
Assignee: Eastman Kodak Co
•
Filing: 1953-08-03
•
Granted: 1954-10-12
•
Expires: 1973-08-03
Abstract
No abstract record available.
Inventors
- 👤 Richard W Henn
- 👤 George A Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/34; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING AN ALKALINE MATERIAL, A 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENT AND A COMPOUND OF THE GROUP CONSISITNG OF REDUCTONE, P-AMINOBENZOIC ACID REDUCTONE, M-SALICYLIC ACID REDUCTONE, P-SALICYLIC ACID REDUCTONE, AND SULFANILIC ACID REDUCTONE.
Claim 2
Dependent Claim
36 words
A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING AN ALKALINE MATERIAL, A 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENT AND A COMPOUND OF THE GROUP CONSISITNG OF REDUCTONE, P-AMINOBENZOIC ACID REDUCTONE, M-SALICYLIC ACID REDUCTONE, P-SALICYLIC ACID REDUCTONE, AND SULFANILIC ACID REDUCTONE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |