US5458798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic and azeotrope-like compositions of a hydrofluorocarbon and a hydrocarbon
Assignee: EIDP Inc
•
Filing: 1994-01-03
•
Granted: 1995-10-17
•
Expires: 2014-01-03
Abstract
Abstract This invention relates to compositions that include at least one hydrocarbon and at least one fluorinated species. Such compositions may be used as refrigerants, cleaning agents, expansion agents for foams such as polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, displacement drying agents, among others.
Inventors
- 👤 Brooks S. Lunger
- 👤 Glenn S. Shealy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:53
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0028; A62D1/0057; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; 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; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
An azeotrope or azeotrope-like composition consisting essentially of at least about 97 wt % of 1,1,1,2-tetrafluoroethane (HFC-134a) and less than about 3 wt % of 2-methylbutane that exists at a temperature of about 18.7° C. and a pressure of about 79.5 psia.
Claim 2
Dependent Claim
42 words
An azeotrope or azeotrope-like composition consisting essentially of at least about 97 wt % of 1,1,1,2-tetrafluoroethane (HFC-134a) and less than about 3 wt % of 2-methylbutane that exists at a temperature of about 18.7° C. and a pressure of about 79.5 psia.
Claim 3
Dependent Claim
42 words
An azeotrope or azeotrope-like composition consisting essentially of at least about 94 wt % of 1,1,2,2-tetrafluoroethane (HFC-134) and less than about 6 wt % of n-pentane that exists at a temperature of about 18.7° C. and a pressure of about 63 psia.
Claim 4
Dependent Claim
42 words
An azeotrope or azeotrope-like composition consisting essentially of at least about 94 wt % of 1,1,2,2-tetrafluoroethane (HFC-134) and less than about 6 wt % of n-pentane that exists at a temperature of about 18.7° C. and a pressure of about 63 psia.
Claim 5
Dependent Claim
42 words
An azeotrope or azeotrope-like composition consisting essentially of at least about 93 wt % of 1,1,2,2-tetrafluoroethane (HFC-134) and less than about 7 wt % of 2-methylbutane that exists at a temperature of about 18.7° C. and a pressure of about 63 psia.
Claim 6
Dependent Claim
42 words
An azeotrope or azeotrope-like composition consisting essentially of at least about 93 wt % of 1,1,2,2-tetrafluoroethane (HFC-134) and less than about 7 wt % of 2-methylbutane that exists at a temperature of about 18.7° C. and a pressure of about 63 psia.
Claim 7
Dependent Claim
13 words
The composition of claim 1, 2, or 3 wherein said composition is non-flammable.
Claim 8
Dependent Claim
31 words
The composition of claim 1, 2, 3 or 4 wherein said composition further consists essentially of at least one additive selected from lubricants, oils, corrosion inhibitors, stabilizers, dyes, and mixtures thereof.
Claim 9
Dependent Claim
17 words
A method of refrigeration comprising condensing and evaporating the composition of claim 1, 2, 3 or 4.
References Cited (Backward Citations)
GB748411A
Cited
US4198313A
Cited
US4138855A
Cited
US4272960A
Cited
US4482465A
Cited
US4810403A
Cited
JPS63308085A
Cited
JPS6479290A
Cited
US5006568A
Cited
JPH01108291A
Cited
JPH01139678A
Cited
JPH01139675A
Cited
JPH01139679A
Cited
JPH01139683A
Cited
JPH01319592A
Cited
EP0372777B1
Cited
US4941986A
Cited
US4944890A
Cited
US4954289A
Cited
US5108637A
Cited
EP0430131A1
Cited
EP0430170A1
Cited
DE4003272A1
Cited
US5026497A
Cited
US5080823A
Cited
WO1991016390A1
Cited
JPH0418485A
Cited
JPH0418484A
Cited
WO1992001762A1
Cited
GB2247462A
Cited
US5198475A
Cited
US5147586A
Cited
US5182040A
Cited
US5304320A
Cited
EP0537045A1
Cited
EP0552075B1
Cited
US5194325A
Cited
EP0558823A1
Cited
EP0565265B1
Cited
US5278196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |