Patent US2639059A successfully refreshed from Google Patents.
US2811168A
Expired / Lapsed
US
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Liquid level control valves
Assignee: Parker Appliance Co
•
Filing: 1952-05-27
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Granted: 1957-10-29
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Expires: 1972-05-27
Abstract
No abstract record available.
Inventors
- 👤 Robert H Davies
- 👤 Jr Frederick E Amon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:13
CPC Classifications
G; G05; G05D; G05D9/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7374
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1871044A
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US1988026A
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US2230145A
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US2262823A
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US2308275A
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US2328323A
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US2683580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |