Patent US3630941A successfully refreshed from Google Patents.
US3630941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared fluorescing systems
Assignee: Wyeth Holdings LLC
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Filing: 1968-09-03
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Granted: 1971-12-28
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Expires: 1988-09-03
Abstract
Abstract AN INFRARED FLUORESCENT SOLUTION COMPRISING 16,17-DIALKOXYVIOLANTHRONES IN A SOLVENT, AND A METHOD FOR OBTAINING INFRARED EMISSION BY RADIANT OR CHEMICAL EXCITATION OF THE FLUORESCENT SOLUTION.
Inventors
- 👤 William Russell Bergmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:27
CPC Classifications
C; C09; C09B; C09B3/00; C09B3/22; C09B3/30; C09B3/36; C09K; C09K11/00; C09K11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |