US4978467A
Expired / Lapsed
US
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Azeotrope-like compositions of pentafluoroethane and difluoromethane
Assignee: Honeywell International Inc
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Filing: 1989-09-26
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Granted: 1990-12-18
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Expires: 2009-09-26
Abstract
Abstract Azeotrope-like compositions of pentafluoroethane and difluoromethane useful for heating and cooling applications.
Inventors
- 👤 Ian R. Shankland
- 👤 Earl A. E. Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:35
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/504; C11D7/505; C09K2205/00; C09K2205/22; C09K2205/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
35 words
Azeotrope-like compositions comprising from about 1.0 to about 50.0 weight percent pentafluoroethane and from about 99.0 weight percent to about 50.0 weight difluoromethane which have a vapor pressure of about 119.0 psia at 32° F.
Claim 2
Dependent Claim
35 words
Azeotrope-like compositions comprising from about 1.0 to about 50.0 weight percent pentafluoroethane and from about 99.0 weight percent to about 50.0 weight difluoromethane which have a vapor pressure of about 119.0 psia at 32° F.
Claim 3
Dependent Claim
32 words
The azeotrope-like compositions of claim 1 consisting essentially of from about 5 weight percent to about 40.0 weight percent pentafluoroethane and from about 95.0 weight percent to about 60.0 weight percent difluoromethane.
Claim 4
Dependent Claim
18 words
Azeotrope-like compositions of claim 1 consisting essentially of about 25 weight percent pentafluoroethane and 75 weight percent difluoromethane.
Claim 5
Dependent Claim
21 words
Azeotrope-like compositions of claim 1 wherein said compositions have a vapor pressure of about 119 ± 5 psia at 32° F.
Claim 6
Dependent Claim
27 words
A method for producing refrigeration which comprises condensing a composition of claim 1 and thereafter evaporating said composition in the vicinity of a body to be cooled.
Claim 7
Dependent Claim
27 words
A method for producing heating which comprises condensing a composition of claim 1 in the vicinity of a body to be heated and thereafter evaporating said composition.
Claim 8
Dependent Claim
28 words
A method for producing refrigeration which comprises condensing a composition of claim 3 and thereafter evaporating the said composition in the vicinity of a body to be cooled.
Claim 9
Dependent Claim
27 words
A method for producing heating which comprises condensing a composition of claim 3 in the vicinity of a body to be heated and thereafter evaporating said composition.
Claim 10
Dependent Claim
27 words
A method for producing refrigeration which comprises condensing a composition of claim 5 and thereafter evaporating said composition in the vicinity of a body to be cooled.
Claim 11
Dependent Claim
27 words
A method for producing heating which comprises condensing a composition of claim 5 in the vicinity of a body to be heated and thereafter evaporating said composition.
Claim 12
Dependent Claim
27 words
A method for producing refrigeration which comprises condensing a composition of claim 7 and thereafter evaporating said composition in the vicinity of a body to be cooled.
Claim 13
Dependent Claim
27 words
A method for producing heating which comprises condensing a composition of claim 7 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) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |