US3637809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antioxidants
Assignee: Novartis Corp
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Filing: 1968-07-05
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Granted: 1972-01-25
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Expires: 1988-07-05
Abstract
Abstract ORGANIC MATERIALS, PARTICULARLY SYNTHETIC POLYMERS SUCH AS POLYPROPLYLENE ARE PROTECTED AGAINST OXIDATION IN AIR, THERMAL DEGRADATION OR DETERIORATION BY INCLUDING, IN SUCH SUBSTANCES, A STABLIZING AMOUNT OF ANTIOXIDANT. THE ANTIOXIDANT IS OBTAINED BY REACTING (A) AN A,8-UNSATURATED ESTER OF A HINDERED HYDROQUINOSE AND (B) HYDROGEN SULFIDE OR A MERCAPTAN.
Inventors
- 👤 Eduard K Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:47
CPC Classifications
C; C11; C11B; C11B5/00; C11B5/0071; C07; C07C; C07C321/00; C07C323/00; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; C09; C09K; C09K15/00; C09K15/04; C09K15/12; C09K15/14
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 |