Patent US2994547A successfully refreshed from Google Patents.
US2994547A
Expired / Lapsed
US
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Seal
Assignee: Muskegon Piston Ring Co
•
Filing: 1958-03-26
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Granted: 1961-08-01
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Expires: 1978-03-26
Abstract
No abstract record available.
Inventors
- 👤 Leonard N Dolhun
- 👤 Richard J Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:32
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1950852A
Cited
US2027505A
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US2233599A
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US2462280A
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US2474123A
Cited
US2556133A
Cited
GB644185A
Cited
DE896876C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |