Patent US3629372A successfully refreshed from Google Patents.
US3629372A
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Stabilization of radial teleblock copolymers
Assignee: Phillips Petroleum Co
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Filing: 1969-09-10
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Granted: 1971-12-21
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Expires: 1989-09-10
Abstract
Abstract RADIAL BLOCK COPOLYMERS OF BUTADIENE AND STYRENE ARE RENDERED STABLE AGAINST DERGRADATION BY THE ADDITION THERETO OF A STABILIZER SYSTEM WHICH COMPRISES (A) A HINDERED PHENOL (B) A SUBSTITUTED AROMATIC SECONDARY AMINE (C) AN ORGANIC PHOSPHITE AND OPTIONALLY (D) A THIODIPROPIONATE.
Inventors
- 👤 William O Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18; C08K5/04; C08K5/13; C08K5/49; C08K5/51; C08K5/52; C08K5/524
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |