Patent US3000854A successfully refreshed from Google Patents.
US3000854A
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US
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Stabilization of polymers
Assignee: Phillips Petroleum Co
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Filing: 1957-02-20
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Granted: 1961-09-19
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Expires: 1977-02-20
Abstract
No abstract record available.
Inventors
- 👤 John A Favre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92228; B29C2948/92323; B29C2948/92361; B29C2948/92409; B29C2948/92485; B29C2948/92504; B29C2948/9258; B29C2948/926; B29C2948/92723; B29C2948/92809; B29C2948/92819; B29C2948/92828; B29C2948/92847
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A PROCESS WHEREIN AN ALKYL-SUBSTITUTED PHENOLIC ANTIOXIDANT IS ADDED TO A NORMALLY SOLID POLYMER OF AN OLEFIN, THE IMPROVEMENT WHICH COMPRISES SUBJECTING A SAMPLE OF THE RESULTING MIXTURE TO ULTRAVIOLET ABSORPTION ANALYSIS WHILE SAID SAMPLE IS MAINTAINED IN THE LIQUID STATE, THUS DETERMINING THE CONCENTRATION OF SAID ANTIOXIDANT IN SAID POLYMER, PRODUCING A CONTROL OUTPUT WHICH IS PROPORTIONAL TO SAID CONCENTRATION, AND VARYING THE RATE OF ADDITION OF SAID ANTIOXIDANT TO SAID POLYMER IN PROPORTION TO SAID CONTROL OUTPUT, AND THUS MAINTAINING SAID CONCENTRATION SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
87 words
IN A PROCESS WHEREIN AN ALKYL-SUBSTITUTED PHENOLIC ANTIOXIDANT IS ADDED TO A NORMALLY SOLID POLYMER OF AN OLEFIN, THE IMPROVEMENT WHICH COMPRISES SUBJECTING A SAMPLE OF THE RESULTING MIXTURE TO ULTRAVIOLET ABSORPTION ANALYSIS WHILE SAID SAMPLE IS MAINTAINED IN THE LIQUID STATE, THUS DETERMINING THE CONCENTRATION OF SAID ANTIOXIDANT IN SAID POLYMER, PRODUCING A CONTROL OUTPUT WHICH IS PROPORTIONAL TO SAID CONCENTRATION, AND VARYING THE RATE OF ADDITION OF SAID ANTIOXIDANT TO SAID POLYMER IN PROPORTION TO SAID CONTROL OUTPUT, AND THUS MAINTAINING SAID CONCENTRATION SUBSTANTIALLY CONSTANT.
References Cited (Backward Citations)
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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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |