Patent US3639378A successfully refreshed from Google Patents.
US3639378A
Expired / Lapsed
US
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Polymerization of propylene with a chromium oxide catalyst activated with a trihydrocarbon aluminum modified with water
Assignee: Himont Inc
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Filing: 1969-10-17
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Granted: 1972-02-01
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Expires: 1989-10-17
Abstract
Abstract PROPYLENE IS POLYMERIZED TO ISOTACTIC POLYPROPYLENE IN HIGH YIELDS AND AT A HIGH RATE USING AS THE CATALYST A CHROMIUM OXIDE EXTENDED ON A SILICA AND ACTIVATED WITH A TRIHYDROCARBON ALUMINUM THAT HAS BEEN REACTED WITH 0.05 TO 1.5 MOLES OF WATER AND OPTIONALLY ALSO WITH 0.05 TO 1.5 MOLES OF AN ALCOHOL OR A PHENOL, THE TOTAL AMOUNT OF WATER AND ALCOHOL OR PHENOL BEING SUCH THAT SOME ALUMINUM-TO-CARBON BONDS REMAIN. PREFERABLY, THE CHROMIUM OXIDE-ON-SILICA CATALYST IS CHROMIC OXIDE THAT HAS BEEN PARTIALLY REDUCED TO FORM ABOUT 55% TO ABOUT 90%.
Inventors
- 👤 Wendell P Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:02
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/06
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |