Patent US2568655A successfully refreshed from Google Patents.
US2568655A
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US
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Steel piston ring
Assignee: SPX Technologies Inc
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Filing: 1949-08-08
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Granted: 1951-09-18
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Expires: 1969-08-08
Abstract
No abstract record available.
Inventors
- 👤 Holly M Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:15
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/14; F16J9/145; F16J9/06; F16J9/061; F16J9/063; F16J9/20; F16J9/203; F16J9/206
Claims Analysis
Total Claims: 0
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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) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |