US3709954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of liquid polymers of olefins
Assignee: Union Carbide Corp
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Filing: 1970-03-16
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Granted: 1973-01-09
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Expires: 1990-03-16
Abstract
Abstract LIQUID POLYMERS OF OLEFINS, AND IN PARTICULAR LIQUID POLYMERS OF ETHYLENE, ARE PREPARED BY POLYMERIZING OLEFIN MONOMER BY CONTACTING THE OLEFIN CHARGE WITH A SUPPORTED BIS(CYCLOPENTADIENYL)CHROMIUM(II) CATALYST IN AN INERT ORGANIC SOLVENT, IN THE ABSENCE OF CHAIN TRANSFER AGENT, AT A TEMPERATURE OF $140*C. AND AT A PRESSURE OF ABOUT 0 TO 1000 P.S.I.G.
Inventors
- 👤 F Karol
- 👤 G Karapinka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
C; C08; C08F; C08F10/00
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |