Patent US3944594A successfully refreshed from Google Patents.
US3944594A
Expired / Lapsed
US
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Polyalkylene glycol esters of hindered phenols substituted alkanoic acid
Assignee: Novartis Corp
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Filing: 1973-11-23
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Granted: 1976-03-16
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Expires: 1993-11-23
Abstract
Abstract Compounds of the formula: ##EQU1## WHEREIN X is oxygen or sulfur, a is an integer from 2 to 6, b is an integer from 3 to 40, and R is ##SPC1## Wherein R 1 is an alkyl group of 1 to 8 carbon atoms, R 2 is hydrogen or an alkyl group of 1 to 8 carbon atoms, and X is an integer from 0 to 6 Are useful as antioxidants for organic materials normally subject to oxidative deterioration, such as polyacetals, polypropylene, and nylon, in amounts of from about 0.005 to about 5% by weight of the composition.
Inventors
- 👤 Eduard K. Kleiner
- 👤 John d. Spivack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:36
CPC Classifications
C; C10; C10M; C10M3/00; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; C08K5/36; C08K5/37; C08K5/375; C09; C09K; C09K15/00; C09K15/04; C09K15/06; C09K15/08; C09K15/12; C09K15/14; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/192; C10L1/198; C10L1/1985; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/34; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2219/00; C10M2219/06; C10M2219/08; C10M2219/082; C10M2219/085; C10M2221/00; C10M2221/04; C10M2221/043; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/20; C10N2040/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A compound of the formula: ##EQU4## wherein a is an integer from 2 to 6, b is an integer from 3 to 40, and R is ##SPC3## wherein R 1 and R 2 are alkyl group of 1 to 8 carbon atoms, x is an integer from 0 to 6.
Claim 2
Dependent Claim
50 words
A compound of the formula: ##EQU4## wherein a is an integer from 2 to 6, b is an integer from 3 to 40, and R is ##SPC3## wherein R 1 and R 2 are alkyl group of 1 to 8 carbon atoms, x is an integer from 0 to 6.
Claim 3
Dependent Claim
20 words
A compound of claim 1 wherein R 1 and R 2 are tertiary alkyl of 4 to 8 carbon atoms.
Claim 4
Dependent Claim
14 words
A compound of claim 1 wherein R 1 and R 2 are tert-butyl groups.
Claim 5
Dependent Claim
11 words
A compound as claimed in claim 3 wherein a is 2.
Claim 6
Dependent Claim
11 words
A compound as claimed in claim 3 wherein a is 4.
Claim 7
Dependent Claim
9 words
A compound of claim 4 wherein x is 2.
Claim 8
Dependent Claim
9 words
A compound of claim 5 wherein x is 2.
Claim 9
Dependent Claim
11 words
A compound of claim 1 which is polytetramethylene ether glycol bis{3-(3,5-di-tert.-butyl-4-hydroxyphenyl)propionate}.
Claim 10
Dependent Claim
10 words
A compound of claim 1 which is tetraethylene glycol bis{3-(3,5-di-tert.-butyl-4-hydroxyphenyl)propionate}.
Claim 11
Dependent Claim
10 words
A compound of claim 1 which is triethylene glycol bis{3-(3,5-di-tert.-butyl-hydroxyphenyl)propionate}.
Claim 12
Dependent Claim
10 words
A compound of claim 1 which is polyethylene glycol bis{3-(3,5-di-tert.-butyl-4-hydroxyphenyl)propionate}.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |