US3131346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential salinity indicating equipment
Assignee: Marine Electric Corp
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Filing: 1959-09-15
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Granted: 1964-04-28
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Expires: 1979-09-15
Abstract
No abstract record available.
Inventors
- 👤 Harry G Parke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:42
CPC Classifications
G; G21; G21C; G21C17/00; G21C17/02; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
APPARATUS FOR DIRECTLY READING THE SALINITY OF A FLUID COMPRISING A CONDUCTIVELY CELL HAVING A PAIR OF ELECTODES AND A TEMPERATURE COMPENSATOR RESISTOR CONNECTED AT ONE TERMINAL TO ONE OF SAID ELECTRODES, AN AMPLIFIER, A SOURCE OF ALTERNATING CURRENT POTENTIAL IN SERIES WITH SAID CONDUCTIVEITY CELL ELECTRODES AND FORMING THE INPUT OF SAID AMPLIFIER, THE OTHER TERMINAL OF SAID TEMPERATURE COMPENSATOR RESISTOR BEING CONNECTED TO THE OUTPUT OF SAID AMPLIFIER WHEREBY THE RESISTOR FORMS A NEGATIVE FEEDBACK CONNECTION TO THE AMPLIFIER INPUT AND THE OUTPUT VOLTAGE OF THE AMPLIFIER IS DIRECTLY PROPORTIONAL TO THE SALINITY OF A FLUID IN WHICH SAID CELL IS IMMERSED.
Claim 2
Dependent Claim
104 words
APPARATUS FOR DIRECTLY READING THE SALINITY OF A FLUID COMPRISING A CONDUCTIVELY CELL HAVING A PAIR OF ELECTODES AND A TEMPERATURE COMPENSATOR RESISTOR CONNECTED AT ONE TERMINAL TO ONE OF SAID ELECTRODES, AN AMPLIFIER, A SOURCE OF ALTERNATING CURRENT POTENTIAL IN SERIES WITH SAID CONDUCTIVEITY CELL ELECTRODES AND FORMING THE INPUT OF SAID AMPLIFIER, THE OTHER TERMINAL OF SAID TEMPERATURE COMPENSATOR RESISTOR BEING CONNECTED TO THE OUTPUT OF SAID AMPLIFIER WHEREBY THE RESISTOR FORMS A NEGATIVE FEEDBACK CONNECTION TO THE AMPLIFIER INPUT AND THE OUTPUT VOLTAGE OF THE AMPLIFIER IS DIRECTLY PROPORTIONAL TO THE SALINITY OF A FLUID IN WHICH SAID CELL IS IMMERSED.
References Cited (Backward Citations)
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US2586169A
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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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |