US3780136A
Expired / Lapsed
US
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Process to reduce the amount of low-molecular-weight and amorphous polymers formed during the preparation of olefin copolymers
Assignee: Standard Oil Co
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Filing: 1971-12-10
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Granted: 1973-12-18
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Expires: 1991-12-10
Abstract
Abstract PRETREATING OF A CATALYST UNDER POLYMERIZATION CONDITIONS WITH A SINGLE OLEFIN PRIOR TO ITS USE FOR COPOLYMERIZING A MIXTURE OF OLEFINS REDUCES THE LOW-MOLECULAR-WEIGHT AND AMORPHOUS MATERIAL FORMED DURING THE POLYMERIZATION PROCESS.
Inventors
- 👤 L Hague
- 👤 H Khelghatian
- 👤 J Jezl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:17
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; Y; Y10; Y10S; Y10S526/00; Y10S526/903; Y10S526/904
Claims Analysis
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |