Patent US5221492A successfully refreshed from Google Patents.
US5221492A
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US
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Azeotropic mixture of perfluoropropane and dimethyl ether
Assignee: EIDP Inc
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Filing: 1991-08-23
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Granted: 1993-06-22
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Expires: 2011-08-23
Abstract
Abstract A binary azeotropic mixture of perfluoropropane or 1,1,1,2,3,3,3-heptafluoropropane and dimethyl ether.
Inventors
- 👤 Philip L. Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C08J2207/00; C08J2207/04; C09K2205/00; C09K2205/10; C09K2205/12; C09K2205/128; C09K2205/32; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A minimum boiling point binary azeotropic mixture, consisting essentially of 40-99.5 weight percent, based on the sum of the weights of (a) and (b), of (a) perfluoropropane and (b) 0.5-60 weight percent, based on the sum of the weights of (a) and (b), of dimethyl ether said minimum boiling point azeotrope consisting of 90.3 weight percent perfluoropropane and 9.7 weight percent dimethyl ether at 0° C.
Claim 2
Dependent Claim
66 words
A minimum boiling point binary azeotropic mixture, consisting essentially of 40-99.5 weight percent, based on the sum of the weights of (a) and (b), of (a) perfluoropropane and (b) 0.5-60 weight percent, based on the sum of the weights of (a) and (b), of dimethyl ether said minimum boiling point azeotrope consisting of 90.3 weight percent perfluoropropane and 9.7 weight percent dimethyl ether at 0° C.
Claim 3
Dependent Claim
21 words
A composition of claim 1 consisting essentially of 40-95 weight % of the perfluoropropane and 5-60 weight % of dimethyl ether.
Claim 4
Dependent Claim
20 words
A composition of claim 1 consisting essentially of 75-95 weight % of the perfluoropropane and 5-25 weight percent dimethyl ether.
Claim 5
Dependent Claim
28 words
In a process for preparing a foamed polymer comprising expanding a polymer with a blowing agent, the improvement wherein the blowing agent is a composition of claim 1.
Claim 6
Dependent Claim
28 words
In a process for preparing a foamed polymer comprising expanding a polymer with a blowing agent, the improvement wherein the blowing agent is a composition of claim 2.
Claim 7
Dependent Claim
28 words
In a process for preparing a foamed polymer comprising expanding a polymer with a blowing agent, the improvement wherein the blowing agent is a composition of claim 3.
Claim 8
Dependent Claim
27 words
A process for providing refrigeration which comprises condensing the composition of claim 1 and thereafter evaporating the composition in the vicinity of a body to be cooled.
Claim 9
Dependent Claim
27 words
A process for providing refrigeration which comprises condensing the composition of claim 2 and thereafter evaporating the composition in the vicinity of a body to be cooled.
Claim 10
Dependent Claim
22 words
In an aerosol composition comprising a propellant and an active agent, the improvement wherein the propellant is a composition of claim 1.
Claim 11
Dependent Claim
22 words
In an aerosol composition comprising a propellant and an active agent, the improvement wherein the propellant is a composition of claim 2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |