US3278306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colour couplers and their production and use in colour photography
Assignee: Ilford Imaging UK Ltd
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Filing: 1963-05-27
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Granted: 1966-10-11
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Greenhalgh Colin William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:57
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212; C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D307/00; C07D307/77; C07D307/78; C07D307/79
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PROCESS FOR THE PRODUCTION OF A PHOTOGRAPHIC COLOUR IMAGE IN A PHOTOGRAPHIC ELEMENT WHICH COMPRISES DEVELOPING A DEVELOPABLE SILVER SALT IMAGE PRESENT IN SAID ELEMENT BY MEANS OF A SUBSTITUTED P-PHENYLENE DIAMINE COLOUR DEVELOPER IN THE PRESENCE OF A COLOUR COUPLER SELECTED FROM THE CLASS CONISTING OF COLOUR COUPLERS OF THE FORMULA:
Claim 2
Dependent Claim
53 words
A PROCESS FOR THE PRODUCTION OF A PHOTOGRAPHIC COLOUR IMAGE IN A PHOTOGRAPHIC ELEMENT WHICH COMPRISES DEVELOPING A DEVELOPABLE SILVER SALT IMAGE PRESENT IN SAID ELEMENT BY MEANS OF A SUBSTITUTED P-PHENYLENE DIAMINE COLOUR DEVELOPER IN THE PRESENCE OF A COLOUR COUPLER SELECTED FROM THE CLASS CONISTING OF COLOUR COUPLERS OF THE FORMULA:
References Cited (Backward Citations)
US3008827A
Cited
US3161512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |