Patent US3274781A successfully refreshed from Google Patents.
US3274781A
Expired / Lapsed
US
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Cryogenic expansion engine
Assignee: Cooper Bessemer Corp
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Filing: 1963-06-17
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Granted: 1966-09-27
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Expires: 1983-06-17
Abstract
No abstract record available.
Inventors
- 👤 Willard A Morain
- 👤 John L Ostborg
- 👤 White David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:48
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
157 words
A CRYOGENIC EXPANSION ENGINE COMPRISING: A CRANKCASE HAVING A CROSS HEAD THEREIN MOUNTED FOR RECIPROCATORY MOVEMENT OF PREDETERMINED STROKE, A CYLINDER HOUSING HAVING A CYLINDER CHAMBER THEREIN IN LINE WITH SAID CROSS HEAD, A PISTON IN SAID CYLINDER CHAMBER, A PISTON ROD CONNECTING SAID PISTON TO SAID CROSS HEAD, A PARTITION CLOSING OFF SAID CRANKCASE AND CONTAINING AN OIL SEAL WHICH SLIDABLY RECEIVES SAID PISTON ROD, AND CYLINDER HOUSING BEING SPACED FROM SEAID OIL SEAL BY A DISTANCE AT LEAST EQUAL TO SAID PREDETERMINED STROKE, A HEAT INSULATING SECTION POSITIONED BETWEEN SAID CRANKCASE AND SAID CYLINDER HOUSING, A CYLINDER HEAD ON THE END OF SAID CYLINDER HOUSING OPPOSITE FROM SAID CRANKCASE, A BLOCK OF SUBSTANTIALLY NON-COMPRESSIBLE INSULATING MATERIAL ON THE OPPOSITE SIDE OF SAID CYLINDER HEAD FROM SAID CYLINDER HOUSING, A VALVE ROCKER BOX POSITIONED AGAINST THE OPPOSITE SIDE OF SAID INSULATING MATERIAL FROM SAID CYLINDER HEAD, VALVE ACTUATING MEANS EXTENDING FROM SAID VALVE ROCKER BOX THROUGH
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |