Patent US3768818A successfully refreshed from Google Patents.
US3768818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring ring for a piston ring assembly
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1971-01-08
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Granted: 1973-10-30
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Expires: 1991-01-08
Abstract
Abstract A spring ring for a piston ring assembly has an H-shaped cross section with the radially inner projection thicker than the raidally outer projection which in turn is thicker than the connecting portion and lateral slits extend radially inward, alternately from the peripheral edges to a slight center overlap.
Inventors
- 👤 H Minegishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:03
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A spring ring for a piston ring assembly, said ring comprising: an essentially solid, continuous ring member including a radial connecting part connecting outer and inner axial projections to each side of the connecting part, said inner projection having a thickness greater than that of the outer projection, And said connecting part between said projections having a thickness smaller than that of the outer projection, and a plurality of narrow, lateral slits extending radially from the inner and outer peripheries of the ring in alternating fashion toward the middle zone of the connecting part and defining therebetween ring portions of H shape cross section.
Claim 2
Dependent Claim
104 words
A spring ring for a piston ring assembly, said ring comprising: an essentially solid, continuous ring member including a radial connecting part connecting outer and inner axial projections to each side of the connecting part, said inner projection having a thickness greater than that of the outer projection, And said connecting part between said projections having a thickness smaller than that of the outer projection, and a plurality of narrow, lateral slits extending radially from the inner and outer peripheries of the ring in alternating fashion toward the middle zone of the connecting part and defining therebetween ring portions of H shape cross section.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |