Patent US2490944A successfully refreshed from Google Patents.
US2490944A
Expired / Lapsed
US
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Reciprocating valve
Assignee: Individual
•
Filing: 1946-01-08
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Granted: 1949-12-13
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Expires: 1966-01-08
Abstract
No abstract record available.
Inventors
- 👤 J D Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:18
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1406869A
Cited
US2011007A
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US2034829A
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US2075600A
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USRE22559E
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US2294702A
Cited
US2337659A
Cited
US2368212A
Cited
US2376322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |