US5275751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope-like compositions of trifluoromethane, carbon dioxide and sulfur hexafluoride
Assignee: Honeywell International Inc
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Filing: 1992-12-22
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Granted: 1994-01-04
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Expires: 2012-12-22
Abstract
Abstract Azeotrope-like compositions comprising trifluoromethane, carbon dioxide and sulfur hexafluoride are stable and have utility as refrigerants for heating and cooling.
Inventors
- 👤 Barbara R. Decaire
- 👤 Peter B. Logsdon
- 👤 Earl A. E. Lund
- 👤 Rajin R. Singh
- 👤 Ian R. Shankland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:03
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C09K2205/00; C09K2205/10; C09K2205/106; C09K2205/134; C09K2205/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
Azeotrope-like compositions consisting essentially of about 20 to about 55 weight percent trifluoromethane, about 20 to about 35 weight percent carbon dioxide and about 25 to about 45 weight percent sulfur hexafluoride which have a vapor pressure of about 15 psia at -87°±1° C.
Claim 2
Dependent Claim
44 words
Azeotrope-like compositions consisting essentially of about 20 to about 55 weight percent trifluoromethane, about 20 to about 35 weight percent carbon dioxide and about 25 to about 45 weight percent sulfur hexafluoride which have a vapor pressure of about 15 psia at -87°±1° C.
Claim 3
Dependent Claim
33 words
A method for producing refrigeration which comprises condensing a refrigerant consisting essentially of the azeotrope-like compositions of claim 1 and thereafter evaporating said refrigerant in the vicinity of a body to be cooled.
Claim 4
Dependent Claim
33 words
A method for producing heating which comprises condensing a refrigerant consisting essentially of the azeotrope-like compositions 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) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |