US3584457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
External combustion power generating system
Assignee: EDWIN COX ASSOCIATES
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Filing: 1969-06-02
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Granted: 1971-06-15
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Expires: 1989-06-02
Abstract
Abstract Heat is converted into mechanical energy by introducing into an expansion engine superheated vapor of a thermally stable fluorine containing organic working fluid having a melting point below the lowest normal ambient temperature at the point of use and a boiling point at ambient atmospheric pressure in the range from about 70* C. to about 120* C. and a thermally stable fluorine containing organic lubricant fluid having a melting point below the lowest normal ambient temperature of the point of use and a boiling point at ambient atmospheric pressure substantially higher than the boiling point of the working fluid, condensing the exhaust vapors from the expansion engine, evaporating and superheating the condensed working fluid and returning the superheated vapor to the expansion engine. Lubricant fluid contained in the exhaust from the expansion engine may be separated prior to the condensation of the working fluid and returned to the engine directly or in admixture with the working fluid.
Inventors
- 👤 John Gordon Davoud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/18; F01D25/22; F01K; F01K25/00; F01K25/06; F01K25/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
A method of converting heat into mechanical energy which comprises evaporating and superheating a thermally stable fluorine containing organic working fluid having a melting point below the lowest normal ambient temperature at the point of use and boiling point at ambient atmospheric pressure in the range from about 70* C. to about 120* C., introducing into an expansion engine the superheated vapor of the working fluid and a thermally stable fluorine containing organic lubricant fluid having a melting point below the lowest normal ambient temperature at the point of use and a boiling point at ambient atmospheric pressure substantially higher than the boiling point of the working fluid, condensing the exhaust vapors from the expansion engine, returning at least a portion of the lubricant fluid contained in the exhaust vapor to the engine, evaporating and superheating condensed working fluid and returning the superheated vapor to the expansion engine.
Claim 2
Independent Claim
148 words
A method of converting heat into mechanical energy which comprises evaporating and superheating a thermally stable fluorine containing organic working fluid having a melting point below the lowest normal ambient temperature at the point of use and boiling point at ambient atmospheric pressure in the range from about 70* C. to about 120* C., introducing into an expansion engine the superheated vapor of the working fluid and a thermally stable fluorine containing organic lubricant fluid having a melting point below the lowest normal ambient temperature at the point of use and a boiling point at ambient atmospheric pressure substantially higher than the boiling point of the working fluid, condensing the exhaust vapors from the expansion engine, returning at least a portion of the lubricant fluid contained in the exhaust vapor to the engine, evaporating and superheating condensed working fluid and returning the superheated vapor to the expansion engine.
Claim 3
Dependent Claim
16 words
A method as defined in claim 1 wherein the working fluid is a polyfluorinated organic substance.
Claim 4
Dependent Claim
14 words
A method as defined in claim 1 wherein the working fluid is a perfluorohydrocarbon.
Claim 5
Dependent Claim
13 words
A method as dEfined in claim 1 wherein the working fluid is perfluoromethylcyclohexane.
Claim 6
Dependent Claim
13 words
A method as defined in claim 1 wherein the working fluid is perfluorodimethylcyclohexane.
Claim 7
Dependent Claim
13 words
A method as defined in claim 1 wherein the working fluid is perfluoroheptane.
Claim 8
Dependent Claim
13 words
A method as defined in claim 1 wherein the working fluid is 2,2,2-trifluoroethanol.
Claim 9
Dependent Claim
17 words
A method as defined in claim 1 wherein the lubricant fluid is a liquid polymer of chloro-trifluorethylene.
Claim 10
Dependent Claim
16 words
A method as defined in claim 1 wherein the lubricant fluid is a fully fluorinated hydrocarbon.
Claim 11
Dependent Claim
14 words
A method as defined in claim 1 wherein the lubricant fluid is a perfluoralkylpolyether.
Claim 12
Dependent Claim
36 words
A method as defined in claim 1 wherein a major portion of the lubricant fluid contained in the exhaust from the expansion engine is separated from the exhaust prior to the condensation of the working fluid.
Claim 13
Dependent Claim
19 words
A method as defined in claim 11 wherein the separated lubricant fluid is returned directly to the expansion engine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |