Patent US2741451A successfully refreshed from Google Patents.
US2741451A
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US
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Fluid flow control devices
Assignee: Individual
•
Filing: 1952-03-04
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Granted: 1956-04-10
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Expires: 1972-03-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Welborn
- 👤 Robert L Treuthart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:47
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/56; F16K31/566; F16K17/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7728
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1480942A
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US1580277A
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US1719687A
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US2070421A
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US2049230A
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US2336647A
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US2521891A
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US2553253A
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US2683582A
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US2625437A
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US2652857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |