Patent US3601693A successfully refreshed from Google Patents.
US3601693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring cell for measuring electrical conductivity of a fluid medium
Assignee: Individual
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Filing: 1969-03-27
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Granted: 1971-08-24
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Expires: 1989-03-27
Abstract
Abstract A measuring cell having current electrodes and voltage electrodes, the current electrodes being serially connected to an alternating current source and a current measuring device and the voltage electrodes being connected to a voltage measuring device whereby the ratio of the measured current flow to the measured voltage is a unique value indicative of the electrolytic conductivity of the medium. Electrical insulating means are positioned adjacent the voltage electrodes to effectively bypass the current flow around the voltage electrodes thereby screening same from the current flow. The insulating means prevents contamination and polarization of the voltage electrodes by the current flow whereby an accurate current measurement and voltage measurement is obtained.
Inventors
- 👤 Jens Jorn Lorentzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
An apparatus for measuring the electrical conductivity of a liquid medium comprising: a cell receptive during use of the apparatus of a liquid medium whose electrical conductivity is to be measured; a plurality of spaced-apart current electrodes disposed in said cell in position to contact the liquid medium; potential applying means for applying an alternating potential between said current electrodes to establish an alternating current flow in the liquid medium along predetermined paths; a current measuring device connected in series with said current electrodes and said potential applying means operable to measure the current flowing between said current electrodes; a pair of voltage electrodes disposed in said cell to contact the liquid medium; bypassing means disposed within said cell for bypassing the current flow around said voltage electrodes to effectively screen said voltage electrodes from said current flow; and means for measuring the potential between said potential electrodes; whereby said liquid conductivity can be established from said measured voltage and said measured current.
Claim 2
Independent Claim
163 words
An apparatus for measuring the electrical conductivity of a liquid medium comprising: a cell receptive during use of the apparatus of a liquid medium whose electrical conductivity is to be measured; a plurality of spaced-apart current electrodes disposed in said cell in position to contact the liquid medium; potential applying means for applying an alternating potential between said current electrodes to establish an alternating current flow in the liquid medium along predetermined paths; a current measuring device connected in series with said current electrodes and said potential applying means operable to measure the current flowing between said current electrodes; a pair of voltage electrodes disposed in said cell to contact the liquid medium; bypassing means disposed within said cell for bypassing the current flow around said voltage electrodes to effectively screen said voltage electrodes from said current flow; and means for measuring the potential between said potential electrodes; whereby said liquid conductivity can be established from said measured voltage and said measured current.
Claim 3
Dependent Claim
41 words
An apparatus as in claim 1 wherein said bypassing means comprises an electrical insulating material having means therein defining at least two pairs of recesses, said current and voltage electrodes being disposed in the first and second pairs of recess, respectively.
Claim 4
Dependent Claim
47 words
An apparatus as in claim 2 wherein each of said recesses has a planar opening, the planar openings of said recesses for said voltage electrodes being disposed at an angle of from 60* to 120* with respect to the path of current flow between said current electrodes.
Claim 5
Dependent Claim
22 words
An apparatus as in claim 1 wherein said current electrodes and said voltage electrodes are mounted coaxially with respect to each other.
Claim 6
Dependent Claim
27 words
An apparatus as in claim 1 wherein said current electrodes have a configuration in the shape of an annulus and are mounted coaxially around said voltage electrodes.
Claim 7
Dependent Claim
26 words
An apparatus as in claim 1 wherein said bypassing means comprises a semicircular cylindrical screen of electrical insulating material disposed substantially coaxially with said voltage electrodes.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |