Patent US2451989A successfully refreshed from Google Patents.
US2451989A
Expired / Lapsed
US
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Motor reversing control system for valves
Assignee: Ohio Brass Co
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Filing: 1944-05-03
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Granted: 1948-10-19
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Expires: 1964-05-03
Abstract
No abstract record available.
Inventors
- 👤 Edward P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:11
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/04; F16K31/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1821514A
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US719768A
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US852539A
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US1931771A
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GB418081A
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US2085086A
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US2119061A
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US2150117A
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US2293809A
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US2362710A
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US2354888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |