Patent US2666569A successfully refreshed from Google Patents.
US2666569A
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Control apparatus for combined fluid compressors and free piston machines
Assignee: Westinghouse Air Brake Co
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Filing: 1948-05-25
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Granted: 1954-01-19
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Expires: 1968-05-25
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Bent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:21
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F04; F04B; F04B31/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2425850A
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US2469739A
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US2600251A
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US2557982A
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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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |