US3261685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature development process using 3-pyrazolidones in acid media
Assignee: Gevaert Photo Producten NV
•
Filing: 1965-09-21
•
Granted: 1966-07-19
•
Expires: 1985-09-21
Abstract
No abstract record available.
Inventors
- 👤 Haes Louis De
- 👤 Rott Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/262; G03C5/3035; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS OF PHOTOGRAPHIC REPRODUCTION COMPRISING SUBJECTING A PHOTOGRAPHIC MATERIAL COMPRISING A SUPPORT AND AN EXPOSED PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER ON ONE SIDE OF SAID SUPPORT TO DEVELOPMENT WITH A 3PYRAZOLIDONE DEVELOPING AGENT, SAID DEVELOPMENT BEING CARRIED OUT BY TREATING SAID EXPOSED PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER WITH AN AQUEOUS SOLUTION IN THE PRESENCE OF SAID 3-PYRAZOLIDONE DEVELOPING AGENT AT A PH OF LESS THAN 7 AND AT A TEMPERATURE FROM 45*C TO 100*C.
Claim 2
Dependent Claim
75 words
A PROCESS OF PHOTOGRAPHIC REPRODUCTION COMPRISING SUBJECTING A PHOTOGRAPHIC MATERIAL COMPRISING A SUPPORT AND AN EXPOSED PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER ON ONE SIDE OF SAID SUPPORT TO DEVELOPMENT WITH A 3PYRAZOLIDONE DEVELOPING AGENT, SAID DEVELOPMENT BEING CARRIED OUT BY TREATING SAID EXPOSED PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER WITH AN AQUEOUS SOLUTION IN THE PRESENCE OF SAID 3-PYRAZOLIDONE DEVELOPING AGENT AT A PH OF LESS THAN 7 AND AT A TEMPERATURE FROM 45*C TO 100*C.
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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |