Patent US3265661A successfully refreshed from Google Patents.
US3265661A
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US
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2, 4, 6-tris (3, 5-di-tert butyl-4-hydroxybenzyl) phenyl alkanoates and polypropylene compositions stabilized therewith
Assignee: Shell USA Inc
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Filing: 1962-04-19
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Granted: 1966-08-09
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Expires: 1982-04-19
Abstract
No abstract record available.
Inventors
- 👤 Albert L Rocklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:51
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/19; C09; C09K; C09K15/00; C09K15/04; C09K15/06; C09K15/08; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
POLYPROPYLENE CONTAINING A STABILIZING AMOUNT OF 2, 4,6-TRIS)3,5-DI-TERT-BUTYL-4-HYDROXYBENZYL) PHENYL ALKANOATE, SAID ALKANOATE RADICAL HAVING UP TO 8 CARBON ATOMS 3. 2,4,6,-TRIS(3,5-DI-TERT-BUTYL-4-HYDROXYBENZYL) PHENYLALKANOATE, SAID ALKANOATE RADICAL HAVING UP TO 8 CARBON ATOMS.
Claim 2
Dependent Claim
31 words
POLYPROPYLENE CONTAINING A STABILIZING AMOUNT OF 2, 4,6-TRIS)3,5-DI-TERT-BUTYL-4-HYDROXYBENZYL) PHENYL ALKANOATE, SAID ALKANOATE RADICAL HAVING UP TO 8 CARBON ATOMS 3. 2,4,6,-TRIS(3,5-DI-TERT-BUTYL-4-HYDROXYBENZYL) PHENYLALKANOATE, SAID ALKANOATE RADICAL HAVING UP TO 8 CARBON ATOMS.
References Cited (Backward Citations)
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Cited
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Cited
US2807639A
Cited
US3116305A
Cited
US3053803A
Cited
US3106570A
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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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |