US3657321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4 4'-alkylidene-diphenol-bis-(di-t-butyl-4'''-hydroxyphenyl) alkanoates
Assignee: Novartis Corp
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Filing: 1969-04-30
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Granted: 1972-04-18
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Expires: 1989-04-30
Abstract
Abstract NOVEL HYDROXYLAKYLARYLALKANOATES AND HYDROXYALKYLBENZOATES ARE PROVIDED BY A PROCEDURE INVOLVING REACTING A SUITABLE DIPHENOL OR A DIHYDROXYBENZENE WITH A HYDROXYALKYLARYLALKANOYL HALIDE OR HYDROXYALKYLBENZOYL HALIDE. THE HYDROXYALKYARYLAKANOATE AND HYDROXYALKYLBENZOATE PRODUCTS ARE USEFUL AS STABILIZERS OF ORGANIC MATERIALS WHICH ARE SUBJECT TO OXIDATION DETERIORATION.
Inventors
- 👤 David Herbert Steinberg
- 👤 Martin Dexter
- 👤 John D Spivack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:08
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/12; C09K15/14; C07; C07C; C07C317/00; C07C323/00; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; C08K5/36; C08K5/37; C08K5/375; C09K15/06; C09K15/08; Y; Y10; Y10S; Y10S524/00; Y10S524/925; Y10S524/926
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |