US3862895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-compensating electrode system
Assignee: GLI International Inc
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Filing: 1972-09-05
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Granted: 1975-01-28
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Expires: 1992-09-05
Abstract
Abstract An electrode type sensing device which employs two separated measuring electrodes of the same type and a common ground for making electrode potential determinations such as dissolved oxygen and pH measurement in a liquid. In one embodiment, one of the measuring electrodes is disposed in a standard solution which is placed in but sealed from the material to be tested except for an electrical communication. In an alternative embodiment, both measuring electrodes are placed in a material, the ion or molecular content of which is to be measured but, at a substantial distance from each other and with a common ground. Both embodiments eliminate the previous problem of temperature and other environmental aspects which affect a reference electrode and the measuring electrode in a different manner.
Inventors
- 👤 Karl Lewis King
- 👤 James R Arrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
A DEVICE FOR MEASURING ION CONCENTRATION OR ELECTRODE POTENTIAL IN AN ELECTROLYTIC TEST SOLUTION COMPRISING: A FIRST MEASURING ELECTRODE MEANS INCLUDING A FIRST SENSING ELEMENT AND AN ELECTROLYTIC STANDARD SOLUTION IN CONTACT THEREWITH AND CONTAINING IONS CORRESPONDING WITH THOSE TO BE MEASURED IN SAID TEST SOLUTION, SAID ELECTRODE MEANS PRODUCING A FIRST POTENTIAL IN RESPONSE TO SAID STANDARD SOLUTION AND SAID MEANS BEING CONSTRUCTED AND ARRANGED FOR SAID STANDARD SOLUTION TO BE PLACED IN ELECTROYLTIC CONTACT WITH SAID TEST SOLUTION, A SECOND MEASURING ELECTRODE MEANS INCLUDING A SECOND SENSING ELEMENT COMPOSED IN THE SAME MATERIAL AS THE FIRST SENSING ELEMENT, SAID SECOND ELECTRODE MEANS BEING CONSTRUCTED AND ARRANGED FOR BEING PLACED IN SAID TEST SOLUTION FOR SAID SECOND SENSING ELEMENT TO PRODUCE A SECOND POTENTIAL IN RESPONSE TO IONS TO BE MEASURED IN SAID TEST SOLUTION, A REFERENCE ELECTRODE MEANS CONSTRUCTED AND ARRANGED FOR BEING IN ELECTRICALLY CONDUCTIVE RELATIONSHIP WITH SAID TEST SOLUTION TO BE MEASURED SIMULTANEOUSLY WITH SAID FIRST AND SECOND ELECTRODE MEANS, SAID REFERENCE ELECTRODE MEANS SERVING AS A COMMON ELECTRICAL REFERENCE POINT FOR SAID FIRST AND SECOND ELECTRODE MEANS, SAID REFERENCE ELECTRODE MEANS BEING CONNECTED TO THE ZERO VOLT REFERENCE OF THE MEASURING CIRCUIT, MEANS FOR MEASURING THE POTENTIAL DIFFERENCE BETWEEN SAID FIRST ELECTRODE MEANS AND SAID REFERENCE ELECTRODE MEANS, MEANS FOR MEASURING THE POTENTIAL DIFFERENCE BETWEEN SAID SECOND ELECTRODE MEANS AND SAID REFERENCE ELECTRODE MEANS, AND MEANS FOR MEASURING THE DIFFERENTIAL POTENTIAL BETWEEN SAID MEASURED POTENTIAL DIFFERENCES.
Claim 2
Independent Claim
241 words
A DEVICE FOR MEASURING ION CONCENTRATION OR ELECTRODE POTENTIAL IN AN ELECTROLYTIC TEST SOLUTION COMPRISING: A FIRST MEASURING ELECTRODE MEANS INCLUDING A FIRST SENSING ELEMENT AND AN ELECTROLYTIC STANDARD SOLUTION IN CONTACT THEREWITH AND CONTAINING IONS CORRESPONDING WITH THOSE TO BE MEASURED IN SAID TEST SOLUTION, SAID ELECTRODE MEANS PRODUCING A FIRST POTENTIAL IN RESPONSE TO SAID STANDARD SOLUTION AND SAID MEANS BEING CONSTRUCTED AND ARRANGED FOR SAID STANDARD SOLUTION TO BE PLACED IN ELECTROYLTIC CONTACT WITH SAID TEST SOLUTION, A SECOND MEASURING ELECTRODE MEANS INCLUDING A SECOND SENSING ELEMENT COMPOSED IN THE SAME MATERIAL AS THE FIRST SENSING ELEMENT, SAID SECOND ELECTRODE MEANS BEING CONSTRUCTED AND ARRANGED FOR BEING PLACED IN SAID TEST SOLUTION FOR SAID SECOND SENSING ELEMENT TO PRODUCE A SECOND POTENTIAL IN RESPONSE TO IONS TO BE MEASURED IN SAID TEST SOLUTION, A REFERENCE ELECTRODE MEANS CONSTRUCTED AND ARRANGED FOR BEING IN ELECTRICALLY CONDUCTIVE RELATIONSHIP WITH SAID TEST SOLUTION TO BE MEASURED SIMULTANEOUSLY WITH SAID FIRST AND SECOND ELECTRODE MEANS, SAID REFERENCE ELECTRODE MEANS SERVING AS A COMMON ELECTRICAL REFERENCE POINT FOR SAID FIRST AND SECOND ELECTRODE MEANS, SAID REFERENCE ELECTRODE MEANS BEING CONNECTED TO THE ZERO VOLT REFERENCE OF THE MEASURING CIRCUIT, MEANS FOR MEASURING THE POTENTIAL DIFFERENCE BETWEEN SAID FIRST ELECTRODE MEANS AND SAID REFERENCE ELECTRODE MEANS, MEANS FOR MEASURING THE POTENTIAL DIFFERENCE BETWEEN SAID SECOND ELECTRODE MEANS AND SAID REFERENCE ELECTRODE MEANS, AND MEANS FOR MEASURING THE DIFFERENTIAL POTENTIAL BETWEEN SAID MEASURED POTENTIAL DIFFERENCES.
Claim 3
Dependent Claim
155 words
The device claimed in claim 1 wherein each of said means for measuring the potential difference between said first electrode and said reference electrode and between said second electrode and said reference electrode comprises a non-inverting high input impedance amplifier means, each of said amplifier means having an output terminal, and non-inverting and inverting input terminals, the non-inverting terminal of one amplifier means being connected to the sensing element of said first electrode means and the non-inverting terminal of the other amplifier means being connected to the sensing element of said second electrode means, the inverting terminal of each amplifier means being connected to its output terminal respectively, each said amplifier means being for producing said potential on its outupt terminal corresponding to the potential it measures between its non-inverting terminal and said reference electrode, said means which measure the differential potential between said measured potential differences being connected between said amplifier means output terminals.
Claim 4
Dependent Claim
24 words
The device as claimed in claim 1 and including a buffering solution between said standard solution and said test solution of unknown ion concentration.
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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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |