Patent US3555904A successfully refreshed from Google Patents.
US3555904A
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Fluid quantity indicating system
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1969-03-24
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Granted: 1971-01-19
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Expires: 1989-03-24
Abstract
Abstract A FLUID QUANTITY INDICATING SYSTEM HAVING A VESSEL CONTAINING A KNOWN CRYOGENIC FLUID, A THERMOCOUPLE SUITABLY EXTENDING INTO SAID FLUID IN SAID VESSEL, AN ELECTRICAL MEASURING DEVICE CONNECTED TO SAID THERMOCOUPLE EXTERNALLY OF SAID VESSEL, AND A SHORTING DEVICE RESPONSIVE TO SAID FLUID QUANTITY TO CAUSE SAID ELECTRICAL MEASURING DEVICE TO INDICATE THE QUANTITY OF FLUID. THE SYSTEM PROVIDES, FLUID QUANTITY INDICATIONS WITHOUT THE NORMAL REQUIREMENT FOR AN EXTERNAL SOURCE OF ELECTRICAL POWER.
Inventors
- 👤 Paul E Lenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:39
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/246; F; F17; F17C; F17C13/00; F17C13/02; F17C13/021; G01F23/30; G01F23/64; G01F23/68; F17C2250/00; F17C2250/04; F17C2250/0404; F17C2250/0408; F17C2250/0413; F17C2250/0417; F17C2250/0439; F17C2250/0486; F17C2250/0491; F17C2250/0495
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |