Patent US3942324A successfully refreshed from Google Patents.
US3942324A
Expired / Lapsed
US
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Hot gas engine
Assignee: Foerenade Fabriksverken AB
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Filing: 1974-07-12
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Granted: 1976-03-09
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Expires: 1994-07-12
Abstract
Abstract A hot gas engine including an injector for introducing a mixture of air and fuel into the combustion chamber to heat the working medium which is circulated in a system of ducts. Fresh air for the combustion of the fuel is preheated in a heat exchanger by exhaust gases from the combustion chamber and conducted to the fuel injector. A heating system for passing a heat exchange fluid to a space to be heated surrounds the combustion chamber, and the heat exchange fluid is thus heated by heat exchange with the exhaust gases.
Inventors
- 👤 Lennart Nils Johansson
- 👤 Ragnar Karl Olof Gronvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:21
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; F02C; F02C1/00; F02C1/04; F02C1/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A hot gas engine in combination with a combustion chamber for generating a heating medium to heat a selected space, comprising: a. injector means for injecting fuel into said combustion chamber; b. intake means for passing combustion air from the atmosphere to said injector means; c. means for passing exhaust gas from said combustion chamber in heat exchange relationship with said intake means; and d. passage means for passing a heat exchange fluid from an intake to an outlet to heat a selected space, said air passage means being disposed in heat exchange relationship with said air intake means and said combustion chamber.
Claim 2
Dependent Claim
103 words
A hot gas engine in combination with a combustion chamber for generating a heating medium to heat a selected space, comprising: a. injector means for injecting fuel into said combustion chamber; b. intake means for passing combustion air from the atmosphere to said injector means; c. means for passing exhaust gas from said combustion chamber in heat exchange relationship with said intake means; and d. passage means for passing a heat exchange fluid from an intake to an outlet to heat a selected space, said air passage means being disposed in heat exchange relationship with said air intake means and said combustion chamber.
Claim 3
Dependent Claim
21 words
A hot gas engine according to claim 1, in which said passage means is disposed substantially concentrically about the combustion chamber.
Claim 4
Dependent Claim
23 words
A hot gas engine according to claim 1, in which a portion of said passage means is disposed adjacent the fuel injector means.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |