US3639381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene process and catalyst
Assignee: Honeywell International Inc
•
Filing: 1968-05-10
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Granted: 1972-02-01
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Expires: 1988-05-10
Abstract
Abstract THIS INVENTION RELATES TO AN IMPROVED METHOD OF PREPARING POLYETHYLENE AS A SLURRY IN AN INERT HYDROCARBON DILUENT. IN ACCORDANCE WITH THE PRESENT INVENTION, LINEAR POLYETHYLENE HAVING A RELATIVELY HIGH MELT INDEX IS OBTAINED BY EMPLOYING A NOVEL CATALYST SYSTEM WHICH IS A MIXTURE OF CHROMIUM OXIDE ON A SILICA BASE AND AN ORGANOALUMINUM COMPOUND PREPARED BY PARTIALLY OXIDIZING A TRIALKYL ALUMINUM COMPOUND WITH AN OXYGEN-CONTAINING GAS. POLYMERIZAION IS CARRIED OUT IN THE PRESENCE OF HYDROGEN. THE POLYETHYLENE OF THIS INVENTION IS READILY PROCESSED AND CAN BE USED IN THE PREPARATION OF FILMS, MOLDED ARTICLES AND OTHER KNOWN USES FOR POLYETHYLENE.
Inventors
- 👤 William J Craven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:56
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; Y; Y10; Y10S; Y10S526/00; Y10S526/905
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 |