US4232525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Working fluid for Rankine cycle
Assignee: Daikin Industries Ltd
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Filing: 1979-01-23
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Granted: 1980-11-11
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Expires: 1999-01-23
Abstract
Abstract A Rankine cycle working fluid containing a mixture of 2,2,3,3-tetrafluoropropanol and water, which is low toxic, incombustible, nonexplosive, noncorrosive and stable, and also has a high critical temperature and forms azeotropic-like composition. It is suited for use in a Rankine cycle using heat source of low temperature.
Inventors
- 👤 Naonori Enjo
- 👤 Hideki Aomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:50
CPC Classifications
F; F01; F01K; F01K25/00; F01K25/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
A working fluid for a Rankine cycle in which the working fluid is vaporized, the vapor is expanded to give a mechanical energy and the vapor is then condensed, which comprises a mixture of 2,2,3,3-tetrafluoropropanol and water.
Claim 2
Dependent Claim
37 words
A working fluid for a Rankine cycle in which the working fluid is vaporized, the vapor is expanded to give a mechanical energy and the vapor is then condensed, which comprises a mixture of 2,2,3,3-tetrafluoropropanol and water.
Claim 3
Dependent Claim
30 words
The working fluid of claim 1, wherein said mixture is the azeotropic-like composition consisting of 93% to 53% by weight of 2,2,3,3-tetrafluoropropanol and 7% to 47% by weight of water.
Claim 4
Dependent Claim
26 words
The working fluid of claim 1, wherein said mixture is the azeotropic composition consisting of 72.5% by weight of 2,2,3,3-tetrafluoropropanol and 27.5% by weight of water.
References Cited (Backward Citations)
US3722211A
Cited
US3940939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |