US3833677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of substituted aromatic compounds
Assignee: Rhone Poulenc SA
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Filing: 1970-02-25
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Granted: 1974-09-03
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Expires: 1990-02-25
Abstract
Abstract FRIEDEL-CRAFTS-TYPE CONDENSATION MAY BE EFFECTED BY UTILISING. AS CATALYST, A DERIVATIVE OF RUTHENIUM, RHODIUM, OSMIUM, OR IRIDINIUM, PARTICULARLY A HALIDE OR HALONTRILE COMPLEX, WHICH CATALYST MAY BE USED IN CONJUNCTION WITH A BRONSTED ACID CATALYST.
Inventors
- 👤 C Grard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:36
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07C; C07C2/00; C07C2/86; C07C2/861; C07C2/862; C07C2/864; C07C37/00; C07C37/11; C07C37/16; C07C37/18; C07C41/00; C07C41/01; C07C41/18; C07C41/30; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/782; C07C49/784; C07C49/84; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07D317/48; C07D317/50; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/22; C07C2527/00; C07C2527/06; C07C2527/128; C07C2527/13; C07C2531/00; C07C2531/16; C07C2601/00; C07C2601/12; C07C2601/14
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |