Patent US3243405A successfully refreshed from Google Patents.
US3243405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of ethylene-propylene copolymer
Assignee: Sunoco Inc
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Filing: 1964-12-02
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Granted: 1966-03-29
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Expires: 1984-12-02
Abstract
No abstract record available.
Inventors
- 👤 Jackson S Boyer
- 👤 Charles E Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:08
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD OF IMPROVING THE PROCESSABILITY OF UNVULCANIZED ETHYLENE-PROPYLENE COPOLYMER RUBBER PRIOR TO VULCANIZATION WHICH COMPRISES, PRIOR TO COMPOUNDING A VULCANIZABLE MIXTURE OF SAID COPOLYMER AND CURING AGENTS COMPRISING CARBON BLACK AND AN ORGANIC PEROXIDE, MASTICATING SAID COPOLYMER TOGETHER WITH ABOUT 0.1 TO 1.0 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE COPOLYMER OF AN ORGANIC PEROXIDE NORMALLY EFFECTIVE TO CROSSLINK SAID COPOLYMER AT A TEMPERATURE ABOVE THE DECOMPOSITION TEMPERATURE OF THE PEROXIDE AND WITHIN THE RANGE OF ABOUT 250*F. AND 400*F. UNTIL THE MOONEY VISCOSITY OF SAID COMPOUNDED VULCANIZABLE MIXTURE IS SUBSTANTIALLY LOWER THAN THE MOONEY VISCOSITY OF SUCH VULCANIZABLE MIXTURE WOULD BE WITHOUT MASTICATING IN THE PRESENCE OF SAID ORGANIC PEROXIDE.
Claim 2
Independent Claim
114 words
A METHOD OF IMPROVING THE PROCESSABILITY OF UNVULCANIZED ETHYLENE-PROPYLENE COPOLYMER RUBBER PRIOR TO VULCANIZATION WHICH COMPRISES, PRIOR TO COMPOUNDING A VULCANIZABLE MIXTURE OF SAID COPOLYMER AND CURING AGENTS COMPRISING CARBON BLACK AND AN ORGANIC PEROXIDE, MASTICATING SAID COPOLYMER TOGETHER WITH ABOUT 0.1 TO 1.0 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE COPOLYMER OF AN ORGANIC PEROXIDE NORMALLY EFFECTIVE TO CROSSLINK SAID COPOLYMER AT A TEMPERATURE ABOVE THE DECOMPOSITION TEMPERATURE OF THE PEROXIDE AND WITHIN THE RANGE OF ABOUT 250*F. AND 400*F. UNTIL THE MOONEY VISCOSITY OF SAID COMPOUNDED VULCANIZABLE MIXTURE IS SUBSTANTIALLY LOWER THAN THE MOONEY VISCOSITY OF SUCH VULCANIZABLE MIXTURE WOULD BE WITHOUT MASTICATING IN THE PRESENCE OF SAID ORGANIC PEROXIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |