US3568436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual seal system
Assignee: Motors Liquidation Co
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Filing: 1969-02-03
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Granted: 1971-03-09
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Expires: 1989-02-03
Abstract
Abstract A DUAL SEAL SYSTEM FOR SEALING RECIPROCATING RODS IN A STIRLING ENGINE AND PREVENTING AN INTERCHANGE OF FLUID BETWEEN A CRANKCASE AND A WORK SPACE CONTAINING A HIGHLY PRESSURIZED WORKING FLUID INCLUDES A FLEXIBLE ROLLING DIAPHRAGM WHICH FORMS A PHYSICAL BARRIER TO THE INTERCHANGE OF FLUID AND A LIMITED LEAKAGE SEAL WHICH ACTS AS A PRIMARY SEALING ELEMENT FOR THE WORKING FLUID AND CONTROLS THE MAXIMUM PRESSURE DIFFERENTIAL ON THE DIAPHRAGM. PRESSURE CONTROL MEANS FLUIDLY COMMUNICATING WITH A CHAMBER BETWEEN THE DIAPHRAGM AND THE LIMITED LEAKAGE SEAL REGULATE THE PRESSURE DIFFERENTIAL ON OPPOSITE SIDES OF THE DIAPHRAGM WITHIN A PREDETERMINED OPERATING RANGE.
Inventors
- 👤 Francis E Heffner
- 👤 Richard R Toepel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:19
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/56; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/0535; F16J3/00; F16J3/06; F02G2253/00; F02G2253/08; Y; Y10; Y10S; Y10S277/00; Y10S277/927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |