Patent US2458147A successfully refreshed from Google Patents.
US2458147A
Expired / Lapsed
US
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Control for free-piston units
Assignee: RTX Corp
•
Filing: 1944-04-15
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Granted: 1949-01-04
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Expires: 1964-04-15
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:38
CPC Classifications
F; F02; F02B; F02B71/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1869787A
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US2076258A
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US2064976A
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US2086162A
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US2108890A
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US2189497A
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US2282562A
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US2319566A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |