Patent US3629323A successfully refreshed from Google Patents.
US3629323A
Expired / Lapsed
US
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Alkyl esters of 2-hydroxy-2-alkoxy 3 3 3-trifluoropropanoic acid
Assignee: EIDP Inc
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Filing: 1969-04-23
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Granted: 1971-12-21
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Expires: 1989-04-23
Abstract
Abstract COMPOUNDS OF THE FORMULAS CF3-C(-OH)(-O-R)-COO-R AND CF3-C(-O-R)2-COO-R WHEREIN R IS ALKYL CONTAINING UP TO 30 CARBON ATOMS, CAN BE PREPARED BY REACTING PERFLUOROPYRUVYL FLUORID WITH A SATURATED HYDROCARBON ALCOHOL AND AN HF SCAVENGER TO NEUTRALIZE HF AND ISOLATING CF3-C(-OH)(-O-R)-COO-R THEN REACTING THE CF3-C(-OH)(-O-R)-COO-R WITH AN ALKALI METAL ALKOXIDE AND A DIALKYL SULFATE CONTAINING UP TO 30 CARBON ATOMS AND ISOLATING CF3-C(-O-R)2-COO-R
Inventors
- 👤 Stanley Selman
- 👤 Edward N Squire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:48
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/32; C07D317/42; C07C; C07C51/00; C07C51/41; C07C51/412; C08; C08F; C08F20/00
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |