US3862053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hindered tris (meta-hydroxybenzyl)cyanurate antioxidants
Assignee: Wyeth Holdings LLC
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Filing: 1972-10-20
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Granted: 1975-01-21
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Expires: 1992-10-20
Abstract
Abstract Compounds of the formula: WHEREIN R is a branched chain alkyl group containing three to about twelve carbon atoms are provided. These compounds are useful as antioxidants in organic substrates, such as polyolefins, rubber, etc. They can be prepared by reacting three moles of 4-alkyl-3-hydroxy-2,6-dimethylbenzyl chloride with one mole of cyanuric acid.
Inventors
- 👤 Peter Vincent Susi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:07
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
A composition as defined in claim 1 wherein R is tertiary butyl.
Claim 2
Dependent Claim
14 words
A composition as defined in claim 1 wherein said organic material is a polyolefin.
Claim 3
Dependent Claim
13 words
A composition as defined in claim 1 wherein said organic material is polypropylene.
Claim 4
Dependent Claim
15 words
A composition as defined in claim 4 which also contains an ester of thiodipropionic acid.
References Cited (Backward Citations)
US3531483A
Cited
US3723428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |