US3580927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet light inhibitors
Assignee: 3M Co
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Filing: 1967-11-24
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Granted: 1971-05-25
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Expires: 1987-11-24
Abstract
Abstract ULTRAVIOLET LIGHT ABSORBERS WITH EXTREMELY LOW VOLATILITY ARE PREPARED BY REACTING 2,4-DIHYDROXYBENZOPHENONE AND ORGANIC DIHALIDES OR DIEPOXIDES. THE RESULTANT COMPOUNDS HAVE THE GENERAL FORMULA (PHENYL-CO-(2-OH-1,4-PHENYLENE)-O-R-O-(3-OH-1,4-PHENYLENE) -CO-)-BENZENE WHERE R IS A DIVALENT ORGANIC RADICAL. THESE COMPOUNDS MAY BE USED AS CARRIERS FOR DYE, PERMITTING THE INTERNAL COLORING OF POLYESTER FILMS AND FIBERS.
Inventors
- 👤 Robert L Wear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:16
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C49/00; C07C49/76; C07C49/84
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |