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US4155865A
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Constant boiling mixtures of 1,1,2,2-tetrafluoroethane and 1,1,1,2-tetrafluorochloroethane
Assignee: Honeywell International Inc
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Filing: 1977-12-27
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Granted: 1979-05-22
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Expires: 1997-12-27
Abstract
Abstract Constant boiling mixtures of 1,1,2,2-tetrafluoroethane and 1,1,1,2-tetrafluorochloroethane are useful as refrigerants, heat transfer media, gaseous dielectrics, expansion agents, aerosol propellants, working fluids in a power cycle and solvents, and are potentially environmentally safe.
Inventors
- 👤 Robert L. Ostrozynski
- 👤 Earl E. A. Lund
- 👤 Hillel Magid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:14
CPC Classifications
F; F01; F01K; F01K25/00; F01K25/08; C; C09; C09K; C09K3/00; C09K3/30; C09K5/00; C09K5/02; C09K5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
Constant boiling mixtures consisting essentially of about 69.1-99.5 weight percent of 1,1,2,2-tetrafluoroethane and about 0.5-30.9 weight percent of 1,1,1,2-tetrafluorochloroethane.
Claim 2
Dependent Claim
19 words
Constant boiling mixtures consisting essentially of about 69.1-99.5 weight percent of 1,1,2,2-tetrafluoroethane and about 0.5-30.9 weight percent of 1,1,1,2-tetrafluorochloroethane.
Claim 3
Dependent Claim
23 words
Constant boiling mixtures according to claim 1 consisting essentially of about 93.3-97.3 weight percent of 1,1,2,2-tetrafluoroethane and about 2.7-6.7 weight percent of 1,1,2,2-tetrafluorochloroethane.
Claim 4
Dependent Claim
31 words
The process of producing refrigeration which comprises condensing a constant boiling mixture as described in claim 1 and thereafter evaporating said mixture in the vicinity of a body to be cooled.
Claim 5
Dependent Claim
24 words
The process of producing refrigeration according to claim 3 in which the constant boiling mixture condensed and evaporated is as defined in claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |