US3671250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bipyridinium compound photosensitizer
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-06-29
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Granted: 1972-06-20
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Expires: 1990-06-29
Abstract
Abstract A RADIATION SENSITIVE MATERIAL BASED ON NITROGENOUS DICATIONS SUCH AS BIPYRIDYLS, PREFERABLY WITH A WATER SOLUBLE POLYMER AS A SUPPORT. SENSITISERS AND DESENSITISERS ARE DECRIBED. THE MATERIALS ARE SENSITIVE TO X-RAYS, ELECTRONS AND U.V. UP TO ABOUT 500 NM., IN THE PRESENCE OF SENSITISERS.
Inventors
- 👤 Timothy Douglas Andrews
- 👤 Glyn David Short
- 👤 Ieuan Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0627; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |