US3922228A
Expired / Lapsed
US
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Azeotropic composition consisting of difluoromethyl trifluoromethylether and dimethyl ether
Assignee: Phillips Petroleum Co
•
Filing: 1973-03-22
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Granted: 1975-11-25
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Expires: 1993-03-22
Abstract
Abstract Azeotropic compositions are formed by difluoromethyl trifluoromethyl ether with dimethyl ether.
Inventors
- 👤 William M Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:24
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K3/00; C09K3/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
The composition according to claim 1 wherein said difluoromethyl trifluoromethyl ether represents about 65.4 weight per cent and said dimethyl ether about 34.6 weight per cent of said composition.
Claim 2
Dependent Claim
20 words
The composition according to claim 1 characterized by a boiling point of about -22* C. at about 741 millimeters mercury.
Claim 3
Dependent Claim
28 words
A substantially constant boiling admixture of a minor amount of difluoromethyl trifluoromethyl ether and a major proportion of dimethyl ether wherein said admixture is characterized as an azeotrope.
Claim 4
Dependent Claim
34 words
The composition according to claim 4 wherein said difluoromethyl trifluoromethyl ether represents about 17.4 weight per cent and said dimethyl ether represents about 82.6 weight per cent of the total weight of said composition.
Claim 5
Dependent Claim
21 words
The composition according to claim 4 further characterized by a boiling point of about -23.4* C. at about 742 millimeters mercury.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |