US3172672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil control ring
Assignee: Ramsey Corp
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Filing: 1958-08-15
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Granted: 1965-03-09
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Expires: 1978-08-15
Abstract
No abstract record available.
Inventors
- 👤 Melvin W Marien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:23
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066; F16J9/069
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PISTON RING ASSEMBLY COMPRISING A PAIR OF CYLINDER-ENGAGING RAILS, AND A SPACER-EXPANDER BETWEEN SAID RAILS FOR SUPPORTING THE RAILS IN AXIALLY SPACED RELATION AND FOR FORCING THE RAILS OUTWARDLY, SAID SPACED-EXPANDER COMPRISING A PAIR OF AXIALLY SPACED FLAT ANNULAR ROWS OF HORIZONTALLY CORRUGATED RAIL SUPPORTS WITH GENERALLY RADIALLY EXTENDING GROOVES IN CIRCUMFERENTIALLY SPACED RELATION ALTERNATELY OPENING INWARD FROM THE OUTER CIRCUMFERENCE OF THE SPACER-EXPANDER AND OUTWARDLY FROM THE INNER CIRCUMFERENCE OF THE SPACER-EXPANDER, INTEGRAL LEGS POSITIONED RADIALLY INWARD FROM THE OUTER CIRCUMFERENCE OF THE SPACER-EXPANDER HOLDING SAID ROWS IN AXIALLY SPACED RELATION, AND CIRCUMFERENTIALLY WIDE LIPS ON THE INNER ENDS OF THE SEGMENTS RADIALLY INWARD FROM THE OUTWARDLY EXTENDING GROOVES AND BETWEEN THE INWARDLY EXTENDING GROOVES.
Claim 2
Dependent Claim
117 words
A PISTON RING ASSEMBLY COMPRISING A PAIR OF CYLINDER-ENGAGING RAILS, AND A SPACER-EXPANDER BETWEEN SAID RAILS FOR SUPPORTING THE RAILS IN AXIALLY SPACED RELATION AND FOR FORCING THE RAILS OUTWARDLY, SAID SPACED-EXPANDER COMPRISING A PAIR OF AXIALLY SPACED FLAT ANNULAR ROWS OF HORIZONTALLY CORRUGATED RAIL SUPPORTS WITH GENERALLY RADIALLY EXTENDING GROOVES IN CIRCUMFERENTIALLY SPACED RELATION ALTERNATELY OPENING INWARD FROM THE OUTER CIRCUMFERENCE OF THE SPACER-EXPANDER AND OUTWARDLY FROM THE INNER CIRCUMFERENCE OF THE SPACER-EXPANDER, INTEGRAL LEGS POSITIONED RADIALLY INWARD FROM THE OUTER CIRCUMFERENCE OF THE SPACER-EXPANDER HOLDING SAID ROWS IN AXIALLY SPACED RELATION, AND CIRCUMFERENTIALLY WIDE LIPS ON THE INNER ENDS OF THE SEGMENTS RADIALLY INWARD FROM THE OUTWARDLY EXTENDING GROOVES AND BETWEEN THE INWARDLY EXTENDING GROOVES.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |