US3798241A
Expired / Lapsed
US
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Bidentate coordinates,their manufacture and application
Assignee: IFP Energies nouvelles
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Filing: 1971-12-07
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Granted: 1974-03-19
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Expires: 1991-12-07
Abstract
Abstract BIDENTATE COORDINATES OF THE FORMULA R2X-R''-YR2, IN WHICH X AND Y ARE PHOSPHORUS, ARSENIC, ANTIMONY OR NITROGEN, R'' IS A HYDROCARBON GROUP CONTAINING AN ASYMMETRIC CARBON ATOM AND THE R GROUPS ARE HYDROCARBON RADICALS, MAY BE ASSOCIATED WITH RHODIUM COMPLEXES TO YIELD HYDROGENATION CATALYSTS USEFUL IN ASYMMETRIC SYNTHESIS. THE SYNTHESIS OF OPTICALLY ACTIVE AMINOACIDS OR AMINES IS CONCERNED.
Inventors
- 👤 H Kagan
- 👤 T Dang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/18; B01J31/1805; B01J31/1895; B01J31/24; B01J31/2404; B01J31/2409; B01J31/2414; C; C07; C07F; C07F7/00; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/5027; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/645; B01J2531/00; B01J2531/02; B01J2531/0286; B01J2531/80; B01J2531/82; B01J2531/822; B01J31/22; B01J31/2282; B01J31/2291; B01J31/2295
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |