Patent US3184245A successfully refreshed from Google Patents.
US3184245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston rings
Assignee: Wellworthy Ltd
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Filing: 1961-02-13
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Granted: 1965-05-18
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Expires: 1981-02-13
Abstract
No abstract record available.
Inventors
- 👤 Woolcott Arthur John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:50
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/14; F16J9/145; F16J9/06; F16J9/064; F16J9/066; F16J9/068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A COMPOSITE PISTON RING ARRANGEMENT COMPRISING A PAIR OF FLAT SPLIT SEALING RINGS FOR LOCATION IN A PISTON RING GROOVE OF A PISTON SO THAT SAID RINGS ABUT THE UPPER AND LOWER LANDS OF SAID GROOVE, A FIRST AXIALLY-CORRUGATED STRIP-FORM EXPANDER SPRING LOCATED BETWEEN SAID SEALING RINGS TO APPLY SAID RINGS TO SAID UPPER AND LOWER LANDS RESPECTIVELY AND A SECOND AXIALLY-CORRUGATED STRIP-FORM EXPANDER SPRING LOCATED WITHIN SAID SEALING RINGS, SAID SECOND EXPANDER SPRING HAVING SHAPED ENDS FOR RESPECTIVELY CONTACTING AN ABUTMENT IN A PISTON-RING GROOVE TO APPLY MUTUALLY OPPOSITE PRESSURES TO THE TWO ENDS OF SAID SECOND EXPANDER SPRING TO CAUSE SAID SECOND EXPANDER SPRING TO APPLY RADIALLY OUTWARD PRESSURE TO SAID SEALING RINGS WITHOUT SAID SECOND EXPANDER SPRING BEING SUPPORTED BY THE BASE OF SAID GROOVE.
Claim 2
Dependent Claim
128 words
A COMPOSITE PISTON RING ARRANGEMENT COMPRISING A PAIR OF FLAT SPLIT SEALING RINGS FOR LOCATION IN A PISTON RING GROOVE OF A PISTON SO THAT SAID RINGS ABUT THE UPPER AND LOWER LANDS OF SAID GROOVE, A FIRST AXIALLY-CORRUGATED STRIP-FORM EXPANDER SPRING LOCATED BETWEEN SAID SEALING RINGS TO APPLY SAID RINGS TO SAID UPPER AND LOWER LANDS RESPECTIVELY AND A SECOND AXIALLY-CORRUGATED STRIP-FORM EXPANDER SPRING LOCATED WITHIN SAID SEALING RINGS, SAID SECOND EXPANDER SPRING HAVING SHAPED ENDS FOR RESPECTIVELY CONTACTING AN ABUTMENT IN A PISTON-RING GROOVE TO APPLY MUTUALLY OPPOSITE PRESSURES TO THE TWO ENDS OF SAID SECOND EXPANDER SPRING TO CAUSE SAID SECOND EXPANDER SPRING TO APPLY RADIALLY OUTWARD PRESSURE TO SAID SEALING RINGS WITHOUT SAID SECOND EXPANDER SPRING BEING SUPPORTED BY THE BASE OF SAID GROOVE.
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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) | 1968-05-17 | 1968-11-16 | 1969-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-17 | 1972-11-16 | 1973-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-17 | 1976-11-16 | 1977-05-18 | $7700.00 | Window Closed / Lapsed |