Patent US3324722A successfully refreshed from Google Patents.
US3324722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous fluid level measuring apparatus
Assignee: Atomic Power Development Associates Inc
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Filing: 1964-12-23
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Granted: 1967-06-13
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Expires: 1984-12-23
Abstract
No abstract record available.
Inventors
- 👤 George H Reicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:33
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/246
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A DEVICE FOR DETECTING CHANGES IN THE LEVEL OF A FLUID, SAID DEVICE COMPRISING AN ELONGATED TUBULAR PROBE, A CONDUCTOR ATTACHED TO THE EXTERIOR OF SAID PROBE AND EXTENDING SUBSTANTIALLY THE LENGTH THEREOF, THE RESISTANCE OF SAID CONDUCTOR VARYING WITH CHANGES IN TEMPERATURE, A HEATER WITHIN SAID PROBE AND EXTENDING SUBSTANTIALLY AXIALLY THE LENGTH THEREOF, SAID PROBE BEING PARTIALLY IMMERSED IN THE FLUID WHOSE CHANGES IN LEVEL ARE TO BE DETECTED, MEANS FOR ENERGIZING SAID HEATER, SAID FLUID HAVING A MUCH GREATER THERMAL CONDUCTIVITY THAN SAID GAS SURROUNDING SAID EXPOSED PORTION OF SAID PROBE WHEREBY SAID HEATER DOES NOT APPRECIABLY RAISE THE TEMPERATURE OF SAID PROBE ADJACENT SAID CONDUCTOR IN SAID FLUID BUT RAISES THE TEMPERATURE OF SAID PROBE ADJACENT SAID CONDUCTOR IN SAID GAS SUBSTANTIALLY ABOVE THE TEMPERATURE OF SAID PROBE IN SAID FLUID, MEANS FOR MEASURING THE TEMPERATURE OF SAID PROBE
Claim 2
Independent Claim
143 words
A DEVICE FOR DETECTING CHANGES IN THE LEVEL OF A FLUID, SAID DEVICE COMPRISING AN ELONGATED TUBULAR PROBE, A CONDUCTOR ATTACHED TO THE EXTERIOR OF SAID PROBE AND EXTENDING SUBSTANTIALLY THE LENGTH THEREOF, THE RESISTANCE OF SAID CONDUCTOR VARYING WITH CHANGES IN TEMPERATURE, A HEATER WITHIN SAID PROBE AND EXTENDING SUBSTANTIALLY AXIALLY THE LENGTH THEREOF, SAID PROBE BEING PARTIALLY IMMERSED IN THE FLUID WHOSE CHANGES IN LEVEL ARE TO BE DETECTED, MEANS FOR ENERGIZING SAID HEATER, SAID FLUID HAVING A MUCH GREATER THERMAL CONDUCTIVITY THAN SAID GAS SURROUNDING SAID EXPOSED PORTION OF SAID PROBE WHEREBY SAID HEATER DOES NOT APPRECIABLY RAISE THE TEMPERATURE OF SAID PROBE ADJACENT SAID CONDUCTOR IN SAID FLUID BUT RAISES THE TEMPERATURE OF SAID PROBE ADJACENT SAID CONDUCTOR IN SAID GAS SUBSTANTIALLY ABOVE THE TEMPERATURE OF SAID PROBE IN SAID FLUID, MEANS FOR MEASURING THE TEMPERATURE OF SAID PROBE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-12 | 1970-12-12 | 1971-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-12 | 1974-12-12 | 1975-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-12 | 1978-12-12 | 1979-06-13 | $7700.00 | Window Closed / Lapsed |