Patent US2447707A successfully refreshed from Google Patents.
US2447707A
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Control apparatus for a plurality of motors
Assignee: Westinghouse Air Brake Co
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Filing: 1945-07-31
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Granted: 1948-08-24
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Expires: 1965-07-31
Abstract
No abstract record available.
Inventors
- 👤 Harry C May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:38
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/002; F15; F15B; F15B11/00; F15B11/16; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/25; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30585; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/70; F15B2211/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1563282A
Cited
US2145547A
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US2130299A
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US2214552A
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US2350662A
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US2388010A
Cited
US2395633A
Cited
US2333530A
Cited
US2386459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |