Patent US3637728A successfully refreshed from Google Patents.
US3637728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-phenylbenzoxazole derivatives
Assignee: BASF Schweiz AG
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Filing: 1969-06-04
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Granted: 1972-01-25
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Expires: 1989-06-04
Abstract
Abstract 2-PHENYLBENZOXAZOLES OF THE FORMULA 2-(4-(X-O3S-(CH2)M-O-)PHENYL),R1,R2-BENZOXAZOLE WHEREIN R1 STANDS FOR HYDROGEN, ALKYL, PHENYLALKYL OR CYCLOALKYL, R2 STANDS FOR HYDROGEN OR ALKYL, M IS 3 OR 4 AND X A CATION. THESE COMPOUNDS ARE VALUABLE ULTRAVIOLET ABSORBERS FOR COSMETIC PURPOSES.
Inventors
- 👤 Christian Luethi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:44
CPC Classifications
A; A61; A61Q; A61Q17/00; A61Q17/04; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D263/57
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |