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US3576640A
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Photographic elements containing a methine dye derived from 1-alkyl-3-alkyl-8-alkyl-9-alkylxanthine
Assignee: Eastman Kodak Co
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Filing: 1967-11-06
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Granted: 1971-04-27
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Expires: 1987-11-06
Abstract
Abstract METHINE DYES DERIVED FROM 1-ALKYL-3-ALKYL-,-ALKYL-9ALKYLXANTHINE ARE ADVANTAGEOUSLY USED IN PHOTOGRAPHIC HYDROPHILIC COLLOID LAYERS AS SPECTRAL SENSITIZERS FOR SILVER HALIDE AND IN HYDROPHILIC COLLOID LIGHT FILTERING LAYERS.
Inventors
- 👤 Earl J Van Lare
- 👤 Leslie G S Brooker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:26
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/18; C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/12; C09; C09B; C09B23/00; C09B23/02; C09B23/04; C09B23/06; C09B23/08; C09B23/083; C09B23/086; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/76; G03C1/825; G03C1/83; G03C1/832; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |