US2744803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston rings
Assignee: Ramsey Corp
•
Filing: 1952-08-09
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Granted: 1956-05-08
•
Expires: 1972-08-09
Abstract
No abstract record available.
Inventors
- 👤 Melvin W Marien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:19
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/14; F16J9/145; F16J9/06; F16J9/064; F16J9/066; F16J9/067; F16J9/068; F16J9/069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1473446A
Cited
US2252199A
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US2390044A
Cited
US2436896A
Cited
US2293450A
Cited
GB555348A
Cited
US2346899A
Cited
US2565042A
Cited
US2635022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |