Patent US3487172A successfully refreshed from Google Patents.
Patent US3037525A successfully refreshed from Google Patents.
US3037525A
Expired / Lapsed
US
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Four-way changeover valve
Assignee: Alco Valve Co
•
Filing: 1957-08-14
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Granted: 1962-06-05
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Expires: 1977-08-14
Abstract
No abstract record available.
Inventors
- 👤 Irvin E Wiegers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:46
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US518026A
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US964866A
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US1119640A
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US2355434A
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US2526709A
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US2616449A
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DE802298C
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FR1071554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |