Patent US2173193A successfully refreshed from Google Patents.
US2808581A
Expired / Lapsed
US
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Liquid level indicators
Assignee: Boeing Co
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Filing: 1954-12-06
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Granted: 1957-10-01
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Expires: 1974-12-06
Abstract
No abstract record available.
Inventors
- 👤 James A Findlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:26
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/245; G01F23/28; G01F23/296; G01F23/2966; G01F23/2967
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2097182A
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US2411248A
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US2414756A
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US2472249A
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US2615080A
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US2668365A
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US2691223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |