US3636077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid addition salts of 5-benzoyl-4-hydroxy - 2 -methoxybenzenesulfonic acid and 4-aminobenzoic acid ester and derivatives thereof
Assignee: Bayer Corp
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Filing: 1968-12-17
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Granted: 1972-01-18
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Expires: 1988-12-17
Abstract
Abstract ACID ADDITION SALTS OF 5-BENZOYL-4-HYDROXY-2-METHOXYBENZENUSFULFONIC ACID AND 4-AMINOBENZOIC ACID AND ESTER DERIVATIVES THEREOF THAT ARE USEFUL AS SUNSCREEN AGENTS. THESE COMPOUNDS ARE PREPARED BY REACTING 2-HYDROXY-4METHOXYBENZOPHENONE WITH A HALOSULFONIC ACID TO FORM AN INTERMEDIATE ARYLSULFONIC ACID AND REACTING THE INTERMEDIATE SULFONIC ACID WITH A LOWER ALKYL 4-AMINOBENZOATE TO FORM A SALT. IF DESIRED, THESE COMPOUNDS MAY BE HYDROLYZED TO FORM 4-CARBOXYPHENYLAMMONIUM 5-BENZOYL4-HYDROXY-2-METHOXYBENZENESULFONATE.
Inventors
- 👤 Dale Adrian Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:13
CPC Classifications
A; A61; A61Q; A61Q17/00; A61Q17/04; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/44; A61K8/445; A61K8/46; A61K8/466; C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/44
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |