Patent US2708561A successfully refreshed from Google Patents.
US2708561A
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US
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Four-way valve
Assignee: AP CONTROLS Corp
•
Filing: 1952-02-18
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Granted: 1955-05-17
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Expires: 1972-02-18
Abstract
No abstract record available.
Inventors
- 👤 Edward C Ehlke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:58
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86815; Y10T137/86879; Y10T137/86895; Y10T137/87265; Y10T137/87322; Y10T137/8741; Y10T137/87507; Y10T137/877; Y10T137/87829
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1511974A
Cited
US1657739A
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US2145575A
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US2194877A
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US2218861A
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US2534031A
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US2515029A
Cited
US2570450A
Cited
US2558938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-16 | 1958-11-15 | 1959-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-16 | 1962-11-15 | 1963-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-16 | 1966-11-15 | 1967-05-17 | $7700.00 | Window Closed / Lapsed |