Patent US3640898A successfully refreshed from Google Patents.
US3640898A
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Rhodium based catalysts for the synthesis of 1 4-dienes
Assignee: EIDP Inc
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Filing: 1969-04-11
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Granted: 1972-02-08
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Expires: 1989-04-11
Abstract
Abstract IMPROVED CATALYST ARE PROVIDED FOR THE SYNTHESIS OF 1,4-DIENES FROM A-MONOOLEFINS AND CONJUGATED DIENES. THE CATALYSTS ARE RHODIUM (III) SALTS IN COMBINATION WITH AMIDES, PHOSPHORAMIDES, PHOSPHINE OXIDES OR WATER. THE IMPROVED CATALYST ALLOW CONTROL OF THE TRANS-CIS RATIO OF THE 1,4-DIENE FORMED AND ARE OPERBLE AT USEFUL RATES IN A WIDE RANGE OF SOLVET SYSTEMS, BOTH PROTONIC AND APROTIC.
Inventors
- 👤 Aaron Chung Liong Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:24
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0255; B01J31/0257; B01J31/0262; B01J27/00; B01J27/06; B01J31/0231; B01J31/0235; B01J31/0245; B01J31/0247; B01J31/0264; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2226; B01J31/223; B01J31/2234; B01J31/2282; B01J31/2291; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; B01J2231/00; B01J2231/30; B01J2231/32; B01J2231/323; B01J2531/00; B01J2531/80; B01J2531/82; B01J2531/822; B01J31/18; B01J31/1805; B01J31/1845; B01J31/185; B01J31/1855; B01J31/24; B01J31/26; B01J31/28; B01J31/30; C07C2527/00; C07C2527/06; C07C2527/128; C07C2527/13; C07C2531/00; C07C2531/02; C07C2531/16; C07C2531/22; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 0
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |