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US5744052A
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Azeotrope-like compositions containing difluoromethane, pentafluoroethane, and carbon dioxide
Assignee: EIDP Inc
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Filing: 1996-04-17
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Granted: 1998-04-28
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Expires: 2016-04-17
Abstract
Abstract Refrigerant compositions are disclosed which are non-flammable when vapor charged and which perform as well as compositions of 50 weight percent difluoromethane and 50 weight percent pentafluoroethane.
Inventors
- 👤 Donald Bernard Bivens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:11
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C09K2205/00; C09K2205/10; C09K2205/106; C09K2205/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
An azeotrope-like composition consisting essentially of 49-55 weight percent difluoromethane, 40-49.5 weight percent pentafluoroethane and about 0.5-3 weight percent carbon dioxide, said composition having a liquid and a vapor phase, wherein when 50 weight percent of an initial composition is evaporated the vapor pressure of the composition changes by less than about 10 percent and further wherein said composition is nonflammable in the vapor phase.
Claim 2
Dependent Claim
65 words
An azeotrope-like composition consisting essentially of 49-55 weight percent difluoromethane, 40-49.5 weight percent pentafluoroethane and about 0.5-3 weight percent carbon dioxide, said composition having a liquid and a vapor phase, wherein when 50 weight percent of an initial composition is evaporated the vapor pressure of the composition changes by less than about 10 percent and further wherein said composition is nonflammable in the vapor phase.
Claim 3
Dependent Claim
26 words
A process for producing refrigeration, comprising condensing a composition of claim 1 and thereafter evaporating said composition in the vicinity of a body to be cooled.
Claim 4
Dependent Claim
26 words
A process for producing heat comprising condensing a composition of claim 1 in the vicinity of a body to be heated, and thereafter evaporating said composition.
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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) | 2001-04-27 | 2001-10-27 | 2002-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-27 | 2005-10-27 | 2006-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-27 | 2009-10-27 | 2010-04-28 | $7700.00 | Window Closed / Lapsed |