US3981927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,2,2,2-Tetrafluoroethyl ethers and process for preparing them
Assignee: Hoechst AG
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Filing: 1974-08-08
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Granted: 1976-09-21
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Expires: 1994-08-08
Abstract
Abstract 1,2,2,2-Tetrafluoroethyl ethers and process for preparing them; the compounds are useful inhalation anesthetics which are distinguished by shorter recovery times.
Inventors
- 👤 Gunther Siegemund
- 👤 Roman Muschaweck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:22
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; A; A61; A61P; A61P23/00; C07C43/123; C07C43/126
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A 1,2,2,2-tetrafluoroethyl ether of the formula CF.sub.3 CHF--O--R, wherein R is methyl or ethyl.
Claim 2
Dependent Claim
14 words
A 1,2,2,2-tetrafluoroethyl ether of the formula CF.sub.3 CHF--O--R, wherein R is methyl or ethyl.
Claim 3
Dependent Claim
10 words
A compound as in claim 1 which is CF.sub.3 CHFOCH.sub.3.
Claim 4
Dependent Claim
11 words
A compound as in claim 1 which is CF.sub.3 CHFOC.sub.2 H.sub.5.
References Cited (Backward Citations)
DE1076113B
Cited
US3764706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |