US2846307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoxazolone couplers in color photography
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1955-10-17
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Granted: 1958-08-05
•
Expires: 1975-10-17
Abstract
No abstract record available.
Inventors
- 👤 Woolley John Mathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:30
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
PROCESS FOR THE PRODUCTION OF COLOUR PHOTOGRAPHIC IMAGES WHICH COMPRISES DEVELOPING AN EXPOSED GELATINOSILVER HALIDE EMULSION LAYER WITH A COLOUR PHOTOGRAPHIC DEVELOPER CONTAINING A PRIMARY AROMATIC MINE DEVELOPING AGENT IN THE PRESENCE OF A COLOUR COUPLER OF THE FORMULA:
Claim 2
Dependent Claim
39 words
PROCESS FOR THE PRODUCTION OF COLOUR PHOTOGRAPHIC IMAGES WHICH COMPRISES DEVELOPING AN EXPOSED GELATINOSILVER HALIDE EMULSION LAYER WITH A COLOUR PHOTOGRAPHIC DEVELOPER CONTAINING A PRIMARY AROMATIC MINE DEVELOPING AGENT IN THE PRESENCE OF A COLOUR COUPLER OF THE FORMULA:
References Cited (Backward Citations)
US2124612A
Cited
US2331326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |