Patent US6018371A successfully refreshed from Google Patents.
US3586544A
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Method of producing piston rings
Assignee: Mecanique de Pringy Ste
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Filing: 1967-07-17
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Granted: 1971-06-22
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Expires: 1987-07-17
Abstract
Abstract D R A W I N G AN ELASTIC PISTON RING, GENERALLY EMPLOYED AS A SCRAPER RING AND ALSO KNOWN AS AN OIL CONTROL RING, OF SPRING STEEL OF THE U-SECTION TYPE, MADE FROM A STRIP OF ROLLED STEEL COMPRISING A GROOVED WEB AND FLANGES CUT-OUT IN ALTERNATE FOLDED PORTIONS SO AS TO HAVE A CROSS-SECTION OF U-SHAPE, THE SAID BAND BEING THEN CUT INTO LENGTHS WHICH ARE ROLLED TO THE SHAPE OF A RING, THE FINAL LATERAL SURFACES OF THE SAID PISTON RING EACH CONSTITUTED BY THE SUCCESSIVE SECTIONS OF EACH FLANGE BEING OBTAINED BYU FLOW OF THE METAL IN AN APPROPRAITE TOOL, BY AN OPERATION KNOWN AS FORGING, WITHOUT OTHER MACHINING ACTION ON THE SAID SURFACES AND A METHOD FOR ITS MANUFACTURE.
Inventors
- 👤 Robert Geffroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:40
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/206; F16J9/203; Y; Y10; Y10S; Y10S277/00; Y10S277/924; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274; Y10T29/49275; Y10T29/49282; Y10T29/49284
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |