Patent US3030929A successfully refreshed from Google Patents.
US3030929A
Expired / Lapsed
US
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Four way valve with pilot operated check valve
Assignee: Webster Electric Co Inc
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Filing: 1960-06-16
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Granted: 1962-04-24
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Expires: 1980-06-16
Abstract
No abstract record available.
Inventors
- 👤 William J Hipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:01
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/01; F16; F16K; F16K15/00; F16K15/18; F16K15/182; F16K15/1823
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1955154A
Cited
US2304380A
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US2362339A
Cited
US2593039A
Cited
US2648346A
Cited
US2868174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |