Patent US2657341A successfully refreshed from Google Patents.
US2657341A
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US
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Liquid level control apparatus
Assignee: Universal Oil Products Co
•
Filing: 1950-07-29
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Granted: 1953-10-27
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Expires: 1970-07-29
Abstract
No abstract record available.
Inventors
- 👤 Benjamin L Covert
- 👤 Harold E Dahlquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:15
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2228163A
Cited
US2150440A
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US2310298A
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US2323128A
Cited
US2457165A
Cited
US2456233A
Cited
US2550430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |