Patent US3004557A successfully refreshed from Google Patents.
US3004557A
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Four-way change-over valve
Assignee: Alco Valve Co
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Filing: 1957-05-29
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Granted: 1961-10-17
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Expires: 1977-05-29
Abstract
No abstract record available.
Inventors
- 👤 Irvin E Wiegers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:40
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/42; F16K31/423; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726; Y10T137/86759; Y10T137/86791
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1316255A
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US837644A
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US1047159A
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DE593365C
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US1911285A
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US2616449A
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US2836196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |