US2682531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconium tetrachloride-ether complexes as low temperature polymerization catalyst
Assignee: Standard Oil Development Co
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Filing: 1951-03-31
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Granted: 1954-06-29
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Expires: 1971-03-31
Abstract
No abstract record available.
Inventors
- 👤 John L Ernst
- 👤 Robert M Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:08
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10; C08F210/12; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE PROCESS OF PREPARING A HYDROCARBON POLYMER WHICH COMPRISES THE STEP OF POLYMERIZING AN ISO-OLEFIN HAVING FROM 4 TO 8 CARBON ATOMS, AT A TEMPERATURE WITHIN THE RANGE OF FROM -20* TO -165* C., IN THE PRESENCE OF A POLYMERIZATION CATALYST OF ZIRCONIUM TETRACHLORIDE COMPLEXED WITH AN ORGANIC ETHER, R-O-R'' IN WHICH R AND R'' ARE ORGANIC RADICALS.
Claim 2
Dependent Claim
58 words
THE PROCESS OF PREPARING A HYDROCARBON POLYMER WHICH COMPRISES THE STEP OF POLYMERIZING AN ISO-OLEFIN HAVING FROM 4 TO 8 CARBON ATOMS, AT A TEMPERATURE WITHIN THE RANGE OF FROM -20* TO -165* C., IN THE PRESENCE OF A POLYMERIZATION CATALYST OF ZIRCONIUM TETRACHLORIDE COMPLEXED WITH AN ORGANIC ETHER, R-O-R'' IN WHICH R AND R'' ARE ORGANIC RADICALS.
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) | 1957-06-28 | 1957-12-28 | 1958-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-28 | 1961-12-28 | 1962-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-28 | 1965-12-28 | 1966-06-29 | $7700.00 | Window Closed / Lapsed |