US4113883A
Expired / Lapsed
US
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Anaesthetic compositions
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1976-04-16
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Granted: 1978-09-12
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Expires: 1996-04-16
Abstract
Abstract A pharmaceutical composition for use as an inhalation anaesthetic containing 1,2,2-trifluoroethyl difluoromethyl ether as active ingredient, and a method of using said ether to produce anaesthesia in a warm-blooded animal.
Inventors
- 👤 Robert David Bagnall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:21
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/075; A61K31/08; A61P; A61P23/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
An anaesthetic composition which comprises as an anaesthetic agent 1,2,2-trifluoroethyl difluoromethyl ether which is admixed with oxygen, wherein the amount of anaesthetic agent in the composition is anaesthetically effective when the composition is administered by inhalation to a warm-blooded animal, and wherein the amount of oxygen in the composition is effective to maintain respiration in said animal when the composition is administered by inhalation.
Claim 2
Dependent Claim
64 words
An anaesthetic composition which comprises as an anaesthetic agent 1,2,2-trifluoroethyl difluoromethyl ether which is admixed with oxygen, wherein the amount of anaesthetic agent in the composition is anaesthetically effective when the composition is administered by inhalation to a warm-blooded animal, and wherein the amount of oxygen in the composition is effective to maintain respiration in said animal when the composition is administered by inhalation.
Claim 3
Dependent Claim
37 words
A composition as claimed in claim 1 which includes a physiologically-acceptable material selected from the group consisting of other inhalant anaesthetics, pharmaceutically inert gases, chemically inert gases present in air, carbon dioxide, water vapour; and pharmaceutically-acceptable stabilisers.
Claim 4
Dependent Claim
21 words
A composition as claimed in claim 1 which contains between 0.25% and 10% volume by volume of the 1,2,2-trifluoroethyl difluoromethyl ether.
Claim 5
Dependent Claim
21 words
A composition as claimed in claim 3 which contains between 0.5% and 6% volume by volume of the 1,2,2-trifluoro-ethyl difluoromethyl ether.
Claim 6
Dependent Claim
21 words
A composition as claimed in claim 1 which contains between 0.25% and 3% volume by volume of the difluoromethyl 1,2,2-trifluoroethyl ether.
Claim 7
Dependent Claim
18 words
A composition as claimed in claim 5 which contains 2% volume by volume of the difluoromethyl 1,2,2-trifluoroethyl ether.
Claim 8
Independent Claim
31 words
A method for producing anaesthesia in a warm-blooded animal which comprises administering by inhalation to said animal an anaesthetically-effective amount of 1,2,2-trifluoroethyl difluoromethyl ether together with sufficient oxygen to maintain respiration.
Claim 9
Independent Claim
31 words
A method for producing anaesthesia in a warm-blooded animal which comprises administering by inhalation to said animal an anaesthetically-effective amount of 1,2,2-trifluoroethyl difluoromethyl ether together with sufficient oxygen to maintain respiration.
References Cited (Backward Citations)
US3769433A
Cited
US3769434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |