US3732273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-methylol-benzoin-sulphonic acid esters
Assignee: Novartis AG
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Filing: 1970-04-01
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Granted: 1973-05-08
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Expires: 1990-04-01
Abstract
Abstract THE INVENTION PROVIDES NOVEL A-METHYLOL-BENZOIN-SULPHONIC ACID ESTERS WHICH MAY BE MANUFACTURED BY REACTINGG EQUIVALENT AMOUNTS OF AN A-HYDROXY-METHYLBENZOIN AND A SULPHONIC ACID ESTER CHLORIDE IN THE PRESENCE OF A HYDROGEN CHLORIDE BINDING AGENT. THE NOVEL COMPOUNDS DECOMPOSE ON IRRADIATION WITH UV LIGHT UNDER LIBERATION OF THE CORRESPONDING SULPHONIC ACID. THEREFORE, THEY ARE SUITABLE FOR USE AS CIRING CATALYSTS WHICH CAN BE ACTIVATED BY UV-RAYS FOR ACID-CURABLE RESINS OR RESIN COMPOSITIONS.
Inventors
- 👤 H Heine
- 👤 H Rudolph
- 👤 H Kreuder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:59
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; C07; C07C; C07C309/00; C07C309/63; C07C309/64; C07C309/68; C07C309/72; C07C309/73; C07C309/74; C09; C09D; C09D167/00; C09D167/08
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |