US3707582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus compound promoted oligomerization of isobutene
Assignee: Sun Research and Development Co
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Filing: 1971-06-07
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Granted: 1972-12-26
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Expires: 1991-06-07
Abstract
Abstract A PROMOTED POLYMERIZATION OF ISOBUTENE TO FORM A POLYISOBUTENE OIL HAVING A VISCOSITY INDEX OF FROM 95 TO 130, USING PHOSPHORUS TRICHLORIDE OR PHOSPHORUS OXYCHLORIDE AS THE PROMOTER, STANNIC CHLORIDE AS THE CATALYST, AND NITROMETHANE AS THE SOLVENT AT FROM -30*C. TO 100*C. AND PREFERABLY FROM 0*C. TO 50*C. THE STANNIC CHLORIDE IS PRESENT IN FROM 0.1 TO 40 AND PREFERABLY 1 TO 20 VOLUME PERCENT AS BASED ON NITROMETHANE AND PHOSPHORUS COMPOUND IS PRESENT IN A VOLUME RATIO OF FROM 0.1:1 TO 5:1 PHOSPHORUS COMPOUND:STANNIC CHLORIDE.
Inventors
- 👤 Gary L Driscoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:31
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/20; C07C2/22; C10; C10M; C10M3/00; C07C2527/00; C07C2527/06; C07C2527/135; C07C2527/14; C07C2527/16; C10M2205/00; C10M2205/02; C10M2205/026; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17; C10N2040/175; C10N2040/18; C10N2040/185; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |