US4267358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic ester inhibitor
Assignee: Borg Warner Corp
•
Filing: 1980-03-13
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Granted: 1981-05-12
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Expires: 2000-03-13
Abstract
Abstract Phenolic esters wherein the phenolic groups are hindered by at least one ortho substituent. The esters are effective to impart thermal stability to olefin polymers. Their structure is as follows: <IMAGE> where R is alkyl or cycloalkyl of 3-8 carbon atoms, R1 is alkyl of 1-6 carbon atoms and n is 1-2.
Inventors
- 👤 Ingenuin Hechenbleikner
- 👤 William P. Enlow
- 👤 James H. Weis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/66; C07C69/73; C07C69/732
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
A phenolic ester having the structure ##STR4## where R is an alkyl or cycloalkyl group having 3-8 carbon atoms, R 1 is an alkyl group having 1-6 carbon atoms, and n is 1-2.
Claim 2
Dependent Claim
33 words
A phenolic ester having the structure ##STR4## where R is an alkyl or cycloalkyl group having 3-8 carbon atoms, R 1 is an alkyl group having 1-6 carbon atoms, and n is 1-2.
Claim 3
Dependent Claim
13 words
The phenolic ester of claim 1 wherein R is a tertiary alkyl group.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |