US3801558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization
Assignee: Shell USA Inc
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Filing: 1971-09-30
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Granted: 1974-04-02
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Expires: 1991-09-30
Abstract
Abstract OLEFIN POLYMER IS PRODUCED BY POLYMERIZING ALPHAOLEFINS OF 2 TO 8 CARBON ATOMS WITH A ZIEGLAR TYPE CATALYST COMPRISING (A) A TRANSITION METAL COMPONENT PRODUCED BY REACTING A TRANSITION METAL COMPOUND IN ITS HIGHEST VALENCE STATE WITH A REDUCING ORGANOMAGNESIUM COM POUND PRODUCED BY REACTING MAGNESIUM METAL AND A HYDROCARBYL HALIDE IN THE PRESENCE OF A HYDROCARBON SOLVENT AND A COMPLEXING AGENT FOR THE ORGANOMAGNESIUM COMPOUND AND (B) AN ORGANOALUMINUM COMPOUND.
Inventors
- 👤 K Fletcher
- 👤 R Haward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:03
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/903; Y10S526/905; Y10S526/907
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |