Patent US2787160A successfully refreshed from Google Patents.
US2787160A
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Ultrasonic liquid depth indicator
Assignee: Sperry Products Inc
•
Filing: 1953-06-29
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Granted: 1957-04-02
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Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Howard E Van Valkenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
G; G01; G01B; G01B17/00; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; Y; Y10; Y10S; Y10S367/00; Y10S367/902; Y10S367/908
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2439130A
Cited
US2472249A
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US2536128A
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US2709918A
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US2602102A
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US2713263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |