Patent US4132420A successfully refreshed from Google Patents.
US4132420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing rings for stirling engines
Assignee: United Stirling AB and Co
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Filing: 1975-12-16
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Granted: 1979-01-02
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Expires: 1995-12-16
Abstract
Abstract Sealing rings located in an annular recess about a piston in a Stirling engine have a continuous sealing ring of polymeric material having an L-shaped cross-section producing an annular flange abutment. A second discontinuous polymeric ring has a surrounding resilient steel strip resting against the abutment so that internal pressure cooperates with the two rings to effect a seal.
Inventors
- 👤 Gunnar S. K. Lundholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:49
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/0535; F16J9/061; F16J9/063; F16J9/28; F02G2253/00; F02G2253/02; Y; Y10; Y10S; Y10S277/00; Y10S277/902
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A sealing device for use in an annular recession of a piston in a Stirling engine cylinder comprising in combination, a continuous ring of polymeric material having an L-shaped cross section located in said recession, a second discontinuous ring of polymeric material located in said recession adjacent said continuous ring, resilient means mounted between said rings to force said rings apart in a radial direction tending to hold said discontinuous ring in contact with the cylinder wall.
Claim 2
Dependent Claim
77 words
A sealing device for use in an annular recession of a piston in a Stirling engine cylinder comprising in combination, a continuous ring of polymeric material having an L-shaped cross section located in said recession, a second discontinuous ring of polymeric material located in said recession adjacent said continuous ring, resilient means mounted between said rings to force said rings apart in a radial direction tending to hold said discontinuous ring in contact with the cylinder wall.
Claim 3
Dependent Claim
19 words
A sealing device as defined in claim 1 wherein the resilient device is a metal strip of undulatory form.
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) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |