US2980660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of olefins
Assignee: California Research LLC
•
Filing: 1956-12-28
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Granted: 1961-04-18
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Expires: 1976-12-28
Abstract
No abstract record available.
Inventors
- 👤 Jack W Ralls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:39
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; C08F10/00; C08F36/00; C08F36/02; C08F36/04; Y; Y10; Y10S; Y10S526/00; Y10S526/903
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A PROCESS FOR POLYMERIZING SELECTED FROM THE GROUP CONSISTING OF 1-OLEFINS CONTAINING 2 TO 6 CARBON ATOMS AND HAVING NO CHAIN BRANCHING CLOSER TO THE OLEFINIC DOUBLE BOND THAN THE 3 CARBON ATOM AND STYRENE, WHICH COMPRISES CONTACTING AT LEAST ONE OF SAID SELECTED MATERIALS WITH A CATLYST CONSISTING ESSENTIALLY OF A DISPERSION OF ALT2CL8 AND AN ALKALI METAL ALUMINUM HYDRIDE IN A NONPOLAR LIQUID AT A TEMPERATURE BELOW ABOUT 150*C.
References Cited (Backward Citations)
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Cited
DE874215C
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BE538782A
Cited
US2905645A
Cited
US2721189A
Cited
US2839518A
Cited
US2886561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |