US3341209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circumferentially expanding compression piston ring
Assignee: Ramsey Corp
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Filing: 1964-08-20
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Granted: 1967-09-12
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Expires: 1984-08-20
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Prasse
- 👤 Donald J Mayhew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:52
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/063; F16J9/064; F16J9/066; F16J9/067; F16J9/069
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
A HIGHLY FLEXIBLE COMPRESSION PISTON RING ASSEMBLY ADAPTED TO CONFORM TO CYLINDER BORE IRREGULARITIES AND EXERT HIGH UNIT SEALING PRESSURES ON THE CYLINDER WITHOUT BOTTOMING IN THE RING GROOVE OF A PISTON RECEIVING ASSEMBLY WHICH COMPRISES A FLAT FACE SOLID DEAD SPLIT IRON RING OF SHALLOW RADIAL DEPTH AND THIN WIDTH TO FIT FREELY FOR TWISTABLE DEFORMATION IN THE RING GROOVE OF THE PISTON, SAID SOLID RING HAVING, IN ITS FREE STATE, A TAPERED OUTER PERIPHERY CONVERGING FROM THE BOTTOM TO THE TOP FLAT FACES OF THE RING, A SPRING METAL CIRCUMFERENTIAL EXPANDER RING WITHIN SAID SOLID RING HAVING AN INNER DIAMETER LARGER THAN THE DIAMETER OF THE RING GROOVE TO BE SPACED RADIALLY OUTWARD THEREFROM AND HAVING AN AXIAL HEIGHT LESS THAN THE AXIAL HEIGHT OF THE RING GROOVE TO PROVIDE A FREE FIT
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |