US3047389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developer and process
Assignee: EIDP Inc
•
Filing: 1958-11-18
•
Granted: 1962-07-31
•
Expires: 1978-11-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Clifford Lee Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; Y; Y10; Y10S; Y10S430/00; Y10S430/135; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR REDUCING AN EXPOSED SILVER HALIDE TO SILVER WHICH COMPRISES SUBJECTING SAID SILVER HALIDE TO THE ACTION OF A DEVELOPER SOLUTION COMPRISING AN AQUEOUS ALKALINE SOLUTION HAVING A PH GREATER THAN 7.6 AND CONTAINING FROM 0.01% TO 5.0% BY WEIGHT OF AT LEAST ONE POLYCYANO COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
51 words
A PROCESS FOR REDUCING AN EXPOSED SILVER HALIDE TO SILVER WHICH COMPRISES SUBJECTING SAID SILVER HALIDE TO THE ACTION OF A DEVELOPER SOLUTION COMPRISING AN AQUEOUS ALKALINE SOLUTION HAVING A PH GREATER THAN 7.6 AND CONTAINING FROM 0.01% TO 5.0% BY WEIGHT OF AT LEAST ONE POLYCYANO COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2788356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |