US5234613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substantially constant boiling compositions of difluoromethane and propane
Assignee: EIDP Inc
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Filing: 1991-09-30
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Granted: 1993-08-10
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Expires: 2011-09-30
Abstract
Abstract Substantially constant boiling compositions that are mixtures of difluoromethane and propane that are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, and expansion agents for polymers.
Inventors
- 👤 Mark B. Shiflett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:42
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; A; A62; A62D; A62D1/00; A62D1/0028; A62D1/0057; C09; C09K; C09K3/00; C09K3/30; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C08J2207/00; C08J2207/04; C09K2205/00; C09K2205/10; C09K2205/12; C09K2205/32; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
50 words
A substantially constant boiling composition consisting essentially of (a) difluoromethane and (b) propane, wherein said composition consists essentially of about 67-75 weight percent difluoromethane, and about 25-33 weight percent propane, and wherein when the temperature is adjusted to 25° C. the vapor pressure of the composition is about 309 psia.
Claim 2
Dependent Claim
50 words
A substantially constant boiling composition consisting essentially of (a) difluoromethane and (b) propane, wherein said composition consists essentially of about 67-75 weight percent difluoromethane, and about 25-33 weight percent propane, and wherein when the temperature is adjusted to 25° C. the vapor pressure of the composition is about 309 psia.
Claim 3
Dependent Claim
30 words
A composition of claim 1 consisting essentially of about 70 weight percent difluoromethane and about 30 weight percent propane having a boiling point of about -15.3° C. at 4832 torr.
Claim 4
Dependent Claim
26 words
A process for cooling which comprises condensing the composition of claim 1 and thereafter evaporating said composition in the vicinity of a body to be cooled.
Claim 5
Dependent Claim
26 words
A process for cooling which comprises condensing the composition of claim 2 and thereafter evaporating said composition in the vicinity of a body to be cooled.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |