US3343415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid level sensors
Assignee: Emerson Process Management Ltd
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Filing: 1965-06-02
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Granted: 1967-09-26
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Expires: 1985-06-02
Abstract
No abstract record available.
Inventors
- 👤 Johnston James Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/265
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
147 words
A FLUID LEVEL SENSOR COMPRISING A PROBE FOR INSERTION IN THE FLUID, A PLURALITY OF CAPACITORS ARRANGED ON THE PROBE AT DIFFERENT LEVELS IN THE FLUID, CONNECTING MEANS FOR CONNECTING THE CAPACITORS IN PARALLEL TO AN ALTERNATING CURRENT SOURCE, FIRST AND SECOND PLURALITIES OF DIODE MEANS, EACH DIODE MEANS HAVING AN ANODE AND A CATHODE, EACH OF SAID CAPACITORS BEING COUPLED TO THE ANODE OF A DIODE MEANS IN SAID FIRST PLURALITY OF DIODE MEANS AND TO THE CATHODE OF A DIODE MEANS IN SAID SECOND PLURALITY OF DIODE MEANS, A PLURALITY OF JUNCTIONS, EACH OF SAID JUNCTIONS BEING CONNECTED TO THE CATHODE OF THE DIODE MEANS IN SAID FIRST PLURALITY OF DIODE MEANS AND TO THE ANODE OF THE DIODE MEANS IN SAID SECOND PLURALITY OF DIODE MEANS, A PLURALITY OF OUTPUT TERMINALS, AND RESPECTIVE MEANS CONNECTING ONE OF SAID JUNCTIONS TO ONE OF SAID TERMINALS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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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) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |