Patent US2215165A successfully refreshed from Google Patents.
Patent US4646738A successfully refreshed from Google Patents.
Patent US3563028A successfully refreshed from Google Patents.
US3563028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implantable radioisotope-fueled stirling engine
Assignee: McDonnell Douglas Corp
•
Filing: 1968-07-22
•
Granted: 1971-02-16
•
Expires: 1988-07-22
Abstract
Abstract LONG-LIFE, RADIOISOTOPE-FUELED, THERMAL REGENERATIVE ENGINE FOR DRIVING A BLOOD PUMP IS USED IN A CIRCULATORY SUPPORT UNIT WHICH IS IMPLANTABLE IN AN ANIMAL. ENGINE INCLUDES AN ENCAPSULATED RADIOISOTOPIC HEAT SOURCE WITH A THERMAL RESERVOIR, A THERMODYNAMIC CONVERTER, A HEAT EXCHANGER USING BLOOD AS THE COOLING MEDIUM, AND A CONTROL DEVICE TO REGULATE ENGINE POWER OUTPUT. THE CONVERTER INCLUDES A CYLINDRER CONTIANING A REGENERATOR AND DRIVE PLUG ASSEMBLY SUSPENDED FROM A COUNTERBALANCED LINKAGE. THE CONTROL DEVICE INCLUDES AN ADJUSTABLE BYPASS VALVE WHICH REGULATES THE PRESSURE DIFFERENCE APPEARING ACROSS THE PLUG TO CONTROL ENGINE SPEED AND, THEREFORE ITS POWER OUTPUT.
Inventors
- 👤 Richard B Goranson
- 👤 Richard P Johnston
- 👤 William R Martini
- 👤 William H Mcdill
- 👤 Jack E Noble
- 👤 Maurice A White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/0435; F02G1/053; F02G1/055; F02G2250/00; F02G2250/27; F02G2280/00; F02G2280/005; F05; F05C; F05C2225/00; F05C2225/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |