US3885393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic load matching device
Assignee: United States Department of Energy
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Filing: 1973-09-07
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Granted: 1975-05-27
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Expires: 1993-09-07
Abstract
Abstract The invention consists of a device for use in an artificial heart which efficiently matches the force/displacement characteristics of a thermodynamic engine to the force/displacement characteristics of the blood. The matching is accomplished hydraulically and allows for interruption of the engine cycle periodically for control purposes.
Inventors
- 👤 John P Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:05
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; A; A61; A61M; A61M60/00; A61M60/10; A61M60/122; A61M60/196; A61M60/40; A61M60/424; A61M60/427; A61M60/80; A61M60/855; A61M60/857; A61M60/89; A61M60/892
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A device for matching load characteristics to engine characteristics comprising: an input shaft from an associated engine cylinder; a first piston at the end of said shaft; a master cylinder containing said shaft and said piston; a nozzle at one end of said master cylinder; a cylindrical transmission tube at the converging end of said nozzle; a conical diffuser at the opposite end of said transmission tube; a slave cylinder connected to said diffuser at the divergent end of said diffuser; a second piston contaiNed within said slave cylinder; and an incompressible fluid contained within said master cylinder, said nozzle, said transmission tube, said diffuser, and said slave cylinder for transmission of motion between said first piston and second piston.
Claim 2
Independent Claim
120 words
A device for matching load characteristics to engine characteristics comprising: an input shaft from an associated engine cylinder; a first piston at the end of said shaft; a master cylinder containing said shaft and said piston; a nozzle at one end of said master cylinder; a cylindrical transmission tube at the converging end of said nozzle; a conical diffuser at the opposite end of said transmission tube; a slave cylinder connected to said diffuser at the divergent end of said diffuser; a second piston contaiNed within said slave cylinder; and an incompressible fluid contained within said master cylinder, said nozzle, said transmission tube, said diffuser, and said slave cylinder for transmission of motion between said first piston and second piston.
Claim 3
Dependent Claim
16 words
The device of claim 1 wherein said transmission tube is of a diameter of 1/2 inch.
Claim 4
Dependent Claim
11 words
The device of claim 2 wherein said incompressible fluid is water.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |