Patent US3892833A successfully refreshed from Google Patents.
US3892833A
Expired / Lapsed
US
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Method of making an ion-selective electrode
Assignee: Panasonic Holdings Corp
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Filing: 1973-11-08
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Granted: 1975-07-01
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Expires: 1993-11-08
Abstract
Abstract A method of making an ion-selective membrane of an ion-selective electrode, comprising the steps of coating surfaces of granules of a sulfide compound selected from the group consisting of CdS, PbS and CuS with layer of Ag2S by chemical reaction in AgNO3 solution, and compressing the resultant granules to form a membrane. The characteristics of the electrode are improved by activating the granules by etching before coating, and further improved by repeating the steps of coating and crushing so as to provide finer granules.
Inventors
- 👤 Masumi Hattori
- 👤 Teizou Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
A METHOD OF MAKING AN ION-SELECTIVE MEMBRANE FOR AN ION-SELECTIVE ELECTRODE, COMPRISING THE STEPS OF COATING THE SURFACE OF CDS GRANULES WITH AN AG2S LAYER FORMED BY REACTING SAID CDS GRANULES WITH AN AGNO3 SOLUTION AND COMPRESSING
Claim 2
Independent Claim
37 words
A METHOD OF MAKING AN ION-SELECTIVE MEMBRANE FOR AN ION-SELECTIVE ELECTRODE, COMPRISING THE STEPS OF COATING THE SURFACE OF CDS GRANULES WITH AN AG2S LAYER FORMED BY REACTING SAID CDS GRANULES WITH AN AGNO3 SOLUTION AND COMPRESSING
Claim 3
Independent Claim
53 words
A method of making an ion-selective membrane for an ion-selective electrode, comprising the steps of coating the surface of CuS granules with an Ag2S layer formed by reacting said CuS granules with an AgNO3 solution and compressing the resultant granules to form a membrane, said membrane being responsive to copper ions in solution.
Claim 4
Independent Claim
53 words
A method of making an ion-selective membrane for an ion-selective electrode, comprising the steps of coating the surface of CuS granules with an Ag2S layer formed by reacting said CuS granules with an AgNO3 solution and compressing the resultant granules to form a membrane, said membrane being responsive to copper ions in solution.
References Cited (Backward Citations)
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |