US3876773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas mixtures containing nitrous oxide
Assignee: BOC Group Ltd
•
Filing: 1973-05-15
•
Granted: 1975-04-08
•
Expires: 1993-05-15
Abstract
Abstract An anaesthetic gas mixture including nitrous oxide, oxygen and a small proportion of carbon dioxide.
Inventors
- 👤 Arthur Bracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:16
CPC Classifications
A; A61; A61K; A61K33/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
AN ANAETHETIC GAS MIXTURE CONTAINING 40 TO 60% OF NITROUS OXIDE, 3 TO 10% OF CARBON DIOXIDE AND 30 55% OXYGEN, THE PROPORTION OF OXYGEN BEING AT LEAST 5 TIMES THAT OF CARBON DIOXIDE.
Claim 2
Dependent Claim
34 words
AN ANAETHETIC GAS MIXTURE CONTAINING 40 TO 60% OF NITROUS OXIDE, 3 TO 10% OF CARBON DIOXIDE AND 30 55% OXYGEN, THE PROPORTION OF OXYGEN BEING AT LEAST 5 TIMES THAT OF CARBON DIOXIDE.
Claim 3
Dependent Claim
30 words
An anaesthetic gas mixture as claimed in claim 1, having a content of 45 to 55% nitrous oxide, 3 to 7% of carbon dioxide and 40 to 50% of oxygen.
Claim 4
Dependent Claim
22 words
An anaesthetic gas mixture as claimed in claim 1 having a content of 50% nitrous oxide, 46% oxygen and 4% carbon dioxide.
Claim 5
Dependent Claim
27 words
An anaesthetic gas mixture as claimed in claim 1 and containing halothane in an effective amount below 1% in addition to the nitrous oxide and carbon dioxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |