US3736307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene-propylene copolymer production with triphenylphosphite as catalyst adjuvant
Assignee: Phillips Petroleum Co
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Filing: 1970-10-26
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Granted: 1973-05-29
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Expires: 1990-10-26
Abstract
Abstract ETHYLENE-PROPYLENE COPOLYMER IS PRODUCED IN A CATALYST SYSTEM COMPRISING DIETHYLALUMINUM CHLORIDE AND TITANIUM TRICHLORIDE AND AS AN ADJUVANT, TRIPHENYLPHOSPHITE. AT A LEVEL OF ABOUT 4-10 MOL PERCENT TRIPHENYLPHOSPHITE BASED ON THE MOLS OF TITANIUM TRICHLORIDE, POLYMER IS PRODUCED WHICH IS MORE EASILY HANDLED IN CONVENTIONAL FINISHING EQUIPMENT AND WHICH CAN BE FABRICATED INTO HIM WHICH IS VIRTUALLY FREE OF FISH EYES AND OTHER IMPERFECTIONS.
Inventors
- 👤 R Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:32
CPC Classifications
C; C08; C08F; C08F210/00
Claims Analysis
Total Claims: 0
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |