US3639481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aryl- and aralkyl-aminobenzophenones
Assignee: Wyeth Holdings LLC
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Filing: 1968-05-16
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Granted: 1972-02-01
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Expires: 1988-05-16
Abstract
Abstract COMPOUNDS OF THE FORMULA PHENYL-CO-PHENYLENE-(CH2)M-NH-(CH2)N-PHENYLENE- IN WHICH M AND N ARE EACH SEPARATELY 0 TO 4, INCLUSIVE AND THE SUM OF M AND N IS AT LEAST 1, Q IS FROM 1 TO 4 INCLUSIVE, AND THE BONDS TO EACH OF THE BENZOPHENONE MOIETY AND THE POLYPHENLYLENE MOIETY IS IN THE 3 OR 4 POSITION ARE A NEW CLASS OF COMPOUNDS WHICH ARE USEFUL IS SOLID SOLUTION IN A PLASTIC MATRIX AS PHOTOCHROMIC MATERIALS, IN WHICH THE COLOR CHANGES WHEN SUBJECT TO AN ACTIVATING RADIATION. INSTEAD OF BENZOPHENONES, XANTHONES AND TRIPHENYLENES ARE ALSON DISCLOSED. (PHENYLENE)Q-H
Inventors
- 👤 John Edwin Innes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; C; C07; C07C; C07C15/00; C07C15/20; C07C15/38; C07C253/00; C07C253/14; C07C45/00; C07C45/004; C07C45/45; C07C45/46; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C46/00; C07C46/02; C07C46/04; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/84; C07D311/86; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |