Patent US5238872A successfully refreshed from Google Patents.
Patent US3644443A successfully refreshed from Google Patents.
US3644443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of carboxylic acids
Assignee: Ethyl Corp
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Filing: 1969-12-08
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Granted: 1972-02-22
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Expires: 1989-12-08
Abstract
Abstract AN INTERGRAL PROCESS FOR PREPARING CARBOXYLIC ACIDS FROM OLEFINS HAVING ABOUT 10 OR MORE CARBON ATOMS CONTAINING WATER AND CARBON MONOXIDE USING A COBALT CATALYST AND A KETONE OR ETHER SOLVENT COMBINED WITH A COBALT RECOVERY STEP WHICH PERMITS DIRECT RECYCLE OF THE CATALYST SO RECOVERED FOR USE IN THE CARBOXYLATION PROCESS.
Inventors
- 👤 Ronald L Shubkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:59
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/10; C07C51/14
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |