US3884959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic esters of anthranilic acid
Assignee: Chevron USA Inc
•
Filing: 1973-02-13
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Granted: 1975-05-20
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Expires: 1993-02-13
Abstract
Abstract Normally solid crystalline polypropylene is stabilized by esters of anthranilic acid of the formula: IN WHICH R is H or an alkyl group of 1 to 4 carbon atoms, R'' and R'''' are H, alkyl groups of 1 to 20 carbon atoms, halogens, and alkoxyl groups of 1 to 20 carbon atoms, R'''''' is an alkyl group of 5 to 20 carbon atoms either straight or branched chain in structure, and Y is H or has the structure: WHEREIN R'''''''' is H or an alkyl group of 1 to 20 carbon atoms, X is -O-, -S-n, or WHERE N AND N'' MAY BE THE SAME OR DIFFERENT AND HAVE A VALUE FROM 1 TO 5, SAID ESTER OF ANTHRANILIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO ENHANCE THE STABILITY OF SAID COMPOSITION AGAINST UV and heat degradation.
Inventors
- 👤 John Howard Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:09
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/41
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
8 words
ESTER OF ANTHRANILIC ACID HAVING THE FOLLOWING STRUCTURE:
Claim 2
Dependent Claim
8 words
ESTER OF ANTHRANILIC ACID HAVING THE FOLLOWING STRUCTURE:
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein X is S.
Claim 4
Dependent Claim
17 words
The compound of claim 1 wherein R'''''' and R'''''''' are alkyl groups of 8 carbon atoms each.
References Cited (Backward Citations)
US3123631A
Cited
US3342801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |