US2816564A
Expired / Lapsed
US
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Automatic fluid flow control system
Assignee: Wilkerson Corp
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Filing: 1955-04-22
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Granted: 1957-12-17
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Expires: 1975-04-22
Abstract
No abstract record available.
Inventors
- 👤 Dewey L Wilkerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/02; G; G05; G05D; G05D7/00; G05D7/01; G05D7/0166; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2205/0329; F17C2205/035; F17C2221/00; F17C2221/03; F17C2221/031; F17C2223/00; F17C2223/01; F17C2223/0107; F17C2223/0123; F17C2250/00; F17C2250/06; F17C2250/0605; F17C2250/0636; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562; Y10T137/2564; Y10T137/2572; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/304; Y10T137/3052; Y10T137/3068; Y10T137/3071
Claims Analysis
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |