Patent US2970474A successfully refreshed from Google Patents.
US2970474A
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Compressor efficiency determining apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1957-08-29
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Granted: 1961-02-07
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Expires: 1977-08-29
Abstract
No abstract record available.
Inventors
- 👤 Robert M Kendig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:46
CPC Classifications
F; F04; F04B; F04B51/00; G; G01; G01L; G01L3/00; G01L3/26; F04B2201/00; F04B2201/12; F04B2201/1201; F04B2205/00; F04B2205/05; F04B2205/09; F04B2207/00; F04B2207/03; F04B2207/04; F04B2207/042
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) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |