US3790597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur derivatives of alkylhydroxyphenyl maleimides and compositions thereof
Assignee: Novartis Corp
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Filing: 1971-04-12
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Granted: 1974-02-05
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Expires: 1991-04-12
Abstract
Abstract NOVEL SULFUR DRIVATIVES OF ALKYLHYDROXYPHENYL MALEIMIDES WERE PREPARED. THE ALKYL-HYDROXYPHENYL MALEIMIDES WERE PREPARED BY FIRST REACTING AN ALKYLHYDROXYPHENYL AMINE WITH MALIEC ANHYDRIDE WITH SUBSEQUENT CYCLIZATION OF THE MALEAMIC ACID TO OBTAIN THE CORRESPONDING MALEIMIDE. THE SULFUR CONTAINING DERIVATIVES OF THE ALKYLHYDROXYPHENYL MALEIMIDE IS PREPARED BY REACTING THE CORRESPONDING MALEIMIDE WITH AN APPROPRIATE MERCAPTAN OR DIMERCAPTAN COMPOUND. THE COMPOUNDS OF THIS INVENTION ARE USEFUL AS STABILIZERS OF ORGANIC MATERIALS WHICH ARE SUBJECT TO OXIDATIVE AND THERMAL DETERIORATION.
Inventors
- 👤 M Knell
- 👤 H Peterli
- 👤 M Dexter
- 👤 B Manor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:18
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |