US3341836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level detector
Assignee: General Equipment and Manufacturing Co Inc
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Filing: 1964-08-06
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Granted: 1967-09-12
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Expires: 1984-08-06
Abstract
No abstract record available.
Inventors
- 👤 Charles R Marcum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A DETECTOR FOR DETECTING THE LEVEL OF A SUBSTANCE EXHIBITING SOME DEGREE OF ELECTRICAL CONDUCTIVITY COMPRISING, IN COMBINATION, A FIRST POTENTIAL, CONDUCTIVE MEANS ESTABLISHING SAID POTENTIAL AS A REFERENCE POTENTIAL CORRESPONDING TO THE POTENTIAL OF SAID SUBSTANCE TO BE DETECTED, A SECOND POTENTIAL NEGATIVE WITH RESPECT TO SAID FIRST POTENTIAL, A POWER LEAD, MEANS FOR PERIODICALLY ENERGIZING SAID POWER LEAD AT SAID SECOND POTENTIAL, AT LEAST ONE SEMICONDUCTOR CONTROLLED RECTIFIER HAVING ITS ANODE CONNECTED TO SAID FIRST CONDUCTIVE MEANS AND ITS CATHODE CONNECTED TO SAID POWER LEAD, A DETECTOR PROBE, SAID RECTIFIER HAVING A CONTROL ELECTRODE CONNECTED TO SAID PROBE, CURRENT DETECTING MEANS CONNECTED IN SERIES WITH SAID POWER LEAD AND SAID CATHODE, AND COUNTING MEANS CONNECTED TO SAID DETECTING MEANS TO PRODUCE AN OUTPUT SIGNAL IN RESPONSE TO A PREDETERMINED NUMBER OF CURRENT PULSES THROUGH SAID CURRENT DETECTING MEANS.
Claim 2
Dependent Claim
140 words
A DETECTOR FOR DETECTING THE LEVEL OF A SUBSTANCE EXHIBITING SOME DEGREE OF ELECTRICAL CONDUCTIVITY COMPRISING, IN COMBINATION, A FIRST POTENTIAL, CONDUCTIVE MEANS ESTABLISHING SAID POTENTIAL AS A REFERENCE POTENTIAL CORRESPONDING TO THE POTENTIAL OF SAID SUBSTANCE TO BE DETECTED, A SECOND POTENTIAL NEGATIVE WITH RESPECT TO SAID FIRST POTENTIAL, A POWER LEAD, MEANS FOR PERIODICALLY ENERGIZING SAID POWER LEAD AT SAID SECOND POTENTIAL, AT LEAST ONE SEMICONDUCTOR CONTROLLED RECTIFIER HAVING ITS ANODE CONNECTED TO SAID FIRST CONDUCTIVE MEANS AND ITS CATHODE CONNECTED TO SAID POWER LEAD, A DETECTOR PROBE, SAID RECTIFIER HAVING A CONTROL ELECTRODE CONNECTED TO SAID PROBE, CURRENT DETECTING MEANS CONNECTED IN SERIES WITH SAID POWER LEAD AND SAID CATHODE, AND COUNTING MEANS CONNECTED TO SAID DETECTING MEANS TO PRODUCE AN OUTPUT SIGNAL IN RESPONSE TO A PREDETERMINED NUMBER OF CURRENT PULSES THROUGH SAID CURRENT DETECTING MEANS.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |