Patent US2908537A successfully refreshed from Google Patents.
US2908537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring
Assignee: Alcoa Corp
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Filing: 1958-02-11
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Granted: 1959-10-13
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Expires: 1978-02-11
Abstract
No abstract record available.
Inventors
- 👤 Egbert M Kipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:45
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/937
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PISTON RING HAVING AN ANNULAR GROOVE IN ITS OUTER FACE, AND A LAMINATED INSERT SEATED IN THE SAID GROOVE, THE SAID LAMINATED INSERT BEING COMPOSED OF ALTERING LAYERS OF POLYTETRAFLUOROETHYLENE AND A FILLER.
Claim 2
Dependent Claim
34 words
A PISTON RING HAVING AN ANNULAR GROOVE IN ITS OUTER FACE, AND A LAMINATED INSERT SEATED IN THE SAID GROOVE, THE SAID LAMINATED INSERT BEING COMPOSED OF ALTERING LAYERS OF POLYTETRAFLUOROETHYLENE AND A FILLER.
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) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |