US3595907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylation of indene
Assignee: Texaco Inc
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Filing: 1968-12-18
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Granted: 1971-07-27
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Expires: 1988-12-18
Abstract
Abstract METHOD OF CARBOXYLATING A COMPOUND OF THE GROUP OF R.C=CH,RCH2CN, INDENE, CYCLOPENADIENE OR FLUORENE, WHERE R IS HYDROCARBYL, COMPRISING CONTACTING SAID COMPOUND WITH CARBON DIOXIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE PRESENCE OF A BASE OF THE FORMULA: R1,(X-O-)BENZENE WHERE X IS SODIUM OR POTASSIUM, R**1 IS HYDROGEN OR ALKYL AND SUBSEQUENTLY ACIDIFYING THE RESULTANT REACTION PRODUCT TO FORM THE CARBOXYLATED PRODUCT.
Inventors
- 👤 Edwin L Patmore
- 👤 William R Siegart
- 👤 Harry Chafetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:31
CPC Classifications
C; C07; C07C; C07C255/00; C07C51/00; C07C51/15; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |