US4165333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antioxidants
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1978-02-21
•
Granted: 1979-08-21
•
Expires: 1998-02-21
Abstract
Abstract Antioxidants such as S-[3-(3,5-ditert.-butyl-4-hydroxyphenyl) propyl] thiomethacrylate are used to stabilize polymers either by being physically incorporated therein or by being polymerized in combination with other monomer to form polymers with built-in antioxidant protection.
Inventors
- 👤 Richard H. Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; C07; C07C; C07C327/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A compound having the following structural formula: ##STR3## wherein R is a tert. alkyl radical containing 4 to 8 carbon atoms, R 1 , R 2 and R 3 are selected from the group consisting of hydrogen, alkyl radicals containing 1 to 4 carbon atoms and wherein n is 1 to 12.
Claim 2
Dependent Claim
52 words
A compound having the following structural formula: ##STR3## wherein R is a tert. alkyl radical containing 4 to 8 carbon atoms, R 1 , R 2 and R 3 are selected from the group consisting of hydrogen, alkyl radicals containing 1 to 4 carbon atoms and wherein n is 1 to 12.
Claim 3
Dependent Claim
36 words
The compound of claim 1 wherein R is tert. butyl, R 1 is hydrogen, R 2 is selected from the group consisting of hydrogen and methyl, R 3 is hydrogen and n is 1 to 3.
Claim 4
Dependent Claim
17 words
The compound as recited in claim 2, selected from the group consisting of S-[2-(3,5-di-tert.-butyl-4-hydroxyphenyl)ethyl]thiomethacrylate; S-[3-(3,5-di-tert.-butyl-4-hydroxyphenyl)propyl]thiomethacrylate; and S-(3,5-di-tert.-butyl-4-hydroxybenzyl)thiomethacrylate.
References Cited (Backward Citations)
US3714122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |