US2952670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization and catalyst therefor
Assignee: Shell USA Inc
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Filing: 1957-08-26
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Granted: 1960-09-13
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Expires: 1977-08-26
Abstract
No abstract record available.
Inventors
- 👤 Rudolph F Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:13
CPC Classifications
C; C08; C08F; C08F10/00; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
IN THE PROCESS FOR THE POLYMERIZATION OF ALPHA-OLEFINS HAVING ONE POLYMERIZABLE >C=CH2 GROUP AT TEMPERATURES BELOW 150*C. AND PRESSURES BELOW 500 P.S.I., THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE POLYMERIZATION IN CONTACT WITH A CATALYST COMPRISING THE RE ACTION PRODUCT OF AN ALUMINUM ALKYL AND DIPHENY L BIS(CYCOLOPENTADIENYL)TITANIUM, THE ALKYL RADICAL OF THE SAID ALUMINUM ALKYL HAVING FROM 1 TO 10 CARBON ATOMS.
References Cited (Backward Citations)
US2827446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |