US3637892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of olefins
Assignee: BP PLC
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Filing: 1968-02-06
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Granted: 1972-01-25
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Expires: 1988-02-06
Abstract
Abstract OLEFINS ARE PREPARED BY COREACTING AN ACYCLIC OLEFIN OF FORMULA R(R1)C=CR2(R3) WHERE THE R SUBSTITUENTS REPRESENT HYDROGEN ATOMS, ALKYL OR ARYL GROUPS, AND AN EASILY POLYMERISABLE OLEFIN E.G. ISOBUTENE, IN THE PRESENCE OF A CATALYST COMPRISING A CARBONYL OF MOLYBDENUM, TUNGSTEN OR RHENIUM SUPPORTED ON ALUMINA, SILICA OR SILICAALUMINA, THE SUPPORT HAVING BEEN MODIFIED BY THE ADDITION OF ALKALI OR ALKALINE EARTH METAL IONS THERETO. CATA.LYSTS MODIFIED IN THIS WAY CATALYSE THE COREACTION OF THE OLEFINS WITHOUT POLYMERISING THE EASILY POLYMERISABLE OLEFIN TO ANY GREAT EXTENT.
Inventors
- 👤 Brian Patrick Mcgrath
- 👤 Christopher Patrick C Bradshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:48
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/02; C07C6/04; B; B01; B01J; B01J21/00; B01J21/02; B01J27/00; B01J27/24; B01J31/00; B01J31/16; B01J31/1616; B01J31/20; B01J31/22; B01J31/2265; B01J2231/00; B01J2231/50; B01J2231/54; B01J2231/543; B01J2531/00; B01J2531/60; B01J2531/64; B01J2531/66; B01J2531/70; B01J2531/74; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2531/00; C07C2531/16; C07C2531/20; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |