Patent US3949554A successfully refreshed from Google Patents.
US3949554A
Expired / Lapsed
US
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Heat engine
Assignee: National Institutes of Health
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Filing: 1974-10-10
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Granted: 1976-04-13
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Expires: 1994-10-10
Abstract
Abstract A regenerative heat engine designed to produce power for the operation of equipment such as an artificial heart is disclosed. The heat engine includes a temperature control heat pipe located around the periphery of the engine cylinder and a temperature distribution heat pipe located around the periphery of the heat source. A flywheel and bellows seal is included as part of the displacer piston drive, and a flexure support is positioned on the hot end of the displacer piston to allow the piston to move longitudinally while restricting lateral motion.
Inventors
- 👤 Jack E. Noble
- 👤 Peter Riggle
- 👤 Stuart G. Emigh
- 👤 William R. Martini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:50
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F04; F04B; F04B25/00; F04B25/02; F01; F01P; F01P3/00; F01P3/22; F01P2003/2278; F02G2254/00; F02G2280/00; F02G2280/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
In a heat engine operating on a regenerative cycle and having a cylinder, a displacer piston reciprocably mounted within said cylinder to form a lower cold chamber and an upper hot chamber, a crankcase adjacent the cylinder, means for controlling the reciprocating motion of said displacer piston disposed within said crankcase, and drive piston means connecting said displacer piston and said control means, said crankcase being in communication with said cylinder in order to allow said drive piston to transmit motion from said control means to said displacer piston, the improvement comprising a bellows seal attached at one end thereof to the lower end of said displacer piston and at the other end thereof to the inner wall of said lower end of said cylinder around the opening through which said crankcase communicates with said cylinder and through which said drive piston means passes, said bellows seal being effective to seal off said crankcase from said cylinder.
Claim 2
Dependent Claim
157 words
In a heat engine operating on a regenerative cycle and having a cylinder, a displacer piston reciprocably mounted within said cylinder to form a lower cold chamber and an upper hot chamber, a crankcase adjacent the cylinder, means for controlling the reciprocating motion of said displacer piston disposed within said crankcase, and drive piston means connecting said displacer piston and said control means, said crankcase being in communication with said cylinder in order to allow said drive piston to transmit motion from said control means to said displacer piston, the improvement comprising a bellows seal attached at one end thereof to the lower end of said displacer piston and at the other end thereof to the inner wall of said lower end of said cylinder around the opening through which said crankcase communicates with said cylinder and through which said drive piston means passes, said bellows seal being effective to seal off said crankcase from said cylinder.
Claim 3
Dependent Claim
28 words
The heat engine of claim 1, further including pivoted coupling means connecting said lower end of said displacer piston and the upper end of said drive piston means.
Claim 4
Dependent Claim
36 words
The heat engine of claim 1, further including a vent for passage of gas between the under side of the bellows and the crankcase, and valve means for controlling the passage of gas through said vent.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |