Patent US2503397A successfully refreshed from Google Patents.
US2503397A
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Pressure fluid follow-up servomotor
Assignee: Ingersoll Rand Co
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Filing: 1945-06-19
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Granted: 1950-04-11
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Expires: 1965-06-19
Abstract
No abstract record available.
Inventors
- 👤 Valley John Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:22
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/14; B; B64; B64C; B64C13/00; Y; Y10; Y10S; Y10S60/00; Y10S60/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US871157A
Cited
US1999834A
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US2062089A
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GB459893A
Cited
US2177098A
Cited
US2243656A
Cited
US2229561A
Cited
US2243781A
Cited
US2401680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |