Patent US2998312A successfully refreshed from Google Patents.
US2998312A
Expired / Lapsed
US
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New process for colour photography
Assignee: Imperial Chemical Industries Ltd
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Filing: 1956-01-23
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Granted: 1961-08-29
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Expires: 1976-01-23
Abstract
No abstract record available.
Inventors
- 👤 Macdonald Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:40
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26; G; G03; G03C; G03C7/00; G03C7/18; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR COLOR PHOTOGRAPHY WHICH COMPRISES DEVELOPING WITH A COLOR FORMING DEVELOPER, AN EXPOSED MULTILAYER PHOTOGRPHIC MATERIAL COMPRISING THREE DIFFERENTLY SENSITIZED GELANINO-SILVER HALIDE EMULSION LAYERS SAID LAYERS CONTAINIG COLOR FORMERS ADAPTED TO YIELD, UPON EXPOSURE AND DEVELOPMENT, YELLOW, CYAN AND MAGENTA COLORED IMAGES IN SEPARATE LAYERS, THE COLOR FORMER YIELDING THE MAGENTA COLORED IMAGE BEING AN AT LEAST SUBSTANTIALLY COLORLESS COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
65 words
A PROCESS FOR COLOR PHOTOGRAPHY WHICH COMPRISES DEVELOPING WITH A COLOR FORMING DEVELOPER, AN EXPOSED MULTILAYER PHOTOGRPHIC MATERIAL COMPRISING THREE DIFFERENTLY SENSITIZED GELANINO-SILVER HALIDE EMULSION LAYERS SAID LAYERS CONTAINIG COLOR FORMERS ADAPTED TO YIELD, UPON EXPOSURE AND DEVELOPMENT, YELLOW, CYAN AND MAGENTA COLORED IMAGES IN SEPARATE LAYERS, THE COLOR FORMER YIELDING THE MAGENTA COLORED IMAGE BEING AN AT LEAST SUBSTANTIALLY COLORLESS COMPOUND OF THE FORMULA:
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |