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US2577022A
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Piston ring
Assignee: Sulzer AG
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Filing: 1946-05-25
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Granted: 1951-12-04
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Expires: 1966-05-25
Abstract
No abstract record available.
Inventors
- 👤 Lieberherr Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:01
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/0023; F16; F16J; F16J9/00; F16J9/12; F16J9/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1186980A
Cited
US1264012A
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US1458207A
Cited
GB302741A
Cited
US1770732A
Cited
GB379938A
Cited
US1970892A
Cited
US2349917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-03 | 1955-06-04 | 1955-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-03 | 1959-06-04 | 1959-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-03 | 1963-06-04 | 1963-12-04 | $7700.00 | Window Closed / Lapsed |