US3639439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rhodium (i) halide complexes
Assignee: Shell USA Inc
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Filing: 1967-11-30
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Granted: 1972-02-01
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Expires: 1987-11-30
Abstract
Abstract AN IMPROVED HOMOGENEOUS HYDROGENATION CATALYST COMPOSITION COMPRISES RHODIUM HALIDE COMPLEXES INCORPORATING STABILIZING PHOSPHINE OR ARSINE LIGANDS, AND EXCESS LIGAND.
Inventors
- 👤 Kenneth C Dewhirst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:37
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/24; B01J31/2404; C; C07; C07C; C07C253/00; C07C253/30; C07F; C07F15/00; C07F15/0006; C07F15/0073; C07F15/008; B01J2231/00; B01J2231/60; B01J2231/64; B01J2231/641; B01J2231/645; B01J2531/00; B01J2531/80; B01J2531/82; B01J2531/822
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |