US3929609A
Expired / Lapsed
US
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Method and apparatus using solid sensor electrode
Assignee: Kimble Glass Inc
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Filing: 1975-01-08
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Granted: 1975-12-30
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Expires: 1995-01-08
Abstract
Abstract A noble metal-glass composite is screen printed on an inert substrate such as a low alkali glass and fired to provide a solid sensor electrode.
Inventors
- 👤 Don N Gray
- 👤 George G Guilbault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16; G01N31/162; G01N31/164; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/115831; Y10T436/116664
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
102 words
In an electrochemical cell for electrochemically determining the end point of a titration reaction, said cell comprising a vessel adapted to contain a titrate, a reference electrode, and a noble metal electrode having a sensing surface exposed for direct contact with said titrate, said reference electrode and said noble metal electrode adapted to be in electrical communication through said titrate and electrically connected to an electrometer through a circuit external from said titrate; the improvement wherein said noble metal electrode sensing surface comprises the composite, solid-state, fusion product of a mixture of noble metal powder and powdered glass, fused to inert substrate.
Claim 2
Dependent Claim
102 words
In an electrochemical cell for electrochemically determining the end point of a titration reaction, said cell comprising a vessel adapted to contain a titrate, a reference electrode, and a noble metal electrode having a sensing surface exposed for direct contact with said titrate, said reference electrode and said noble metal electrode adapted to be in electrical communication through said titrate and electrically connected to an electrometer through a circuit external from said titrate; the improvement wherein said noble metal electrode sensing surface comprises the composite, solid-state, fusion product of a mixture of noble metal powder and powdered glass, fused to inert substrate.
Claim 3
Dependent Claim
20 words
The cell of claim 1 wherein said sensing surface comprises about from 50% to 99% by weight of noble metal.
Claim 4
Dependent Claim
18 words
The cell of claim 1 wherein said noble metal is gold, silver, platinum, palladium or a mixture thereof.
Claim 5
Dependent Claim
10 words
The cell of claim 1 wherein said substrate is glass.
Claim 6
Dependent Claim
13 words
The cell of claim 1 wherein said substrate is a low alkali glass.
Claim 7
Dependent Claim
21 words
The cell of claim 5 wherein said low alkali glass contains about 44.9% SiO2, 19.0% Al2O3, 15.1% MgO and 21.0% CaO.
Claim 8
Dependent Claim
10 words
The cell of claim 1 wherein said substrate is alumina.
Claim 9
Dependent Claim
17 words
The cell of claim 1 wherein the glass present in said composite is a low alkali glass.
Claim 10
Dependent Claim
77 words
IN THE METHOD FOR ELECTROCHEMICALLY DETERMINING THE END POINT OF A TITRATION WHEREIN A TITRANT IS ADDED TO A TITRATE AND THE TITRATION IS ELECTROCHEMICALLY MONITORED USING A REFERENCE ELECTRODE AND A NOBLE METAL ELECTRODE HAVING A SENSING SURFACE IN DIRECT CONTACT WITH SAID TITRATE, THE IMPROVEMENT WHEREIN SAID NOBLE METAL ELECTRODE HAS A SENSING SURFACE COMPRISING THE COMPOSITE, SOLIDSTATE, FUSION PRODUCT OF A MIXTURE OF NOBLE METAL POWDER AND POWDERED GLASS, FUSED TO AN INERT SUBSTRATE
Claim 11
Dependent Claim
77 words
IN THE METHOD FOR ELECTROCHEMICALLY DETERMINING THE END POINT OF A TITRATION WHEREIN A TITRANT IS ADDED TO A TITRATE AND THE TITRATION IS ELECTROCHEMICALLY MONITORED USING A REFERENCE ELECTRODE AND A NOBLE METAL ELECTRODE HAVING A SENSING SURFACE IN DIRECT CONTACT WITH SAID TITRATE, THE IMPROVEMENT WHEREIN SAID NOBLE METAL ELECTRODE HAS A SENSING SURFACE COMPRISING THE COMPOSITE, SOLIDSTATE, FUSION PRODUCT OF A MIXTURE OF NOBLE METAL POWDER AND POWDERED GLASS, FUSED TO AN INERT SUBSTRATE
Claim 12
Dependent Claim
20 words
The method of claim 9 wherein said sensing surface comprises about from 50% to 99% by weight of noble metal.
Claim 13
Dependent Claim
18 words
The method of claim 9 wherein said noble metal is gold, silver, platinum, palladium or a mixture thereof.
Claim 14
Dependent Claim
10 words
The method of claim 9 wherein said substrate is glass.
Claim 15
Dependent Claim
13 words
The method of claim 9 wherein said substrate is a low alkali glass.
Claim 16
Dependent Claim
21 words
The method of claim 13 wherein said low alkali glass contains about 44.9% SiO2, 19.0% Al2O3, 15.1% MgO and 21.0% CaO.
Claim 17
Dependent Claim
10 words
The method of claim 9 wherein said substrate is alumina.
Claim 18
Dependent Claim
17 words
The method of claim 9 wherein the glass present in said composite is a low alkali glass.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |