US4263343A
Expired / Lapsed
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Reference elements for ion-selective membrane electrodes
Assignee: Clinical Diagnostic Systems Inc
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Filing: 1979-08-13
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Granted: 1981-04-21
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Expires: 1999-08-13
Abstract
Abstract A reference element for ion-selective membrane electrodes is prepared by coating portions of a layer of silver with a composition comprising a metal salt electrolyte, a hydrophilic binder and a membrane of the group consisting of an oxidizing agent and a silver halide emulsion.
Inventors
- 👤 Sang H. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:24
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A process of preparing a metal/silver halide reference element comprising coating portions of a metal support, or a metal layer on a support, with a composition comprising a metal salt electrolyte having a cation which is selected from ammonium, alkali metals and alkaline earth metals and an anion which is a halogen or sulfur, a hydrophilic binder and a member of the group consisting of an oxidizing agent and a silver halide emulsion, with the proviso that if the oxidizing agent is used, the metal layer or metal support is silver and at least one of the metal salt electrolyte and oxidizing agent contains halide ions.
Claim 2
Dependent Claim
106 words
A process of preparing a metal/silver halide reference element comprising coating portions of a metal support, or a metal layer on a support, with a composition comprising a metal salt electrolyte having a cation which is selected from ammonium, alkali metals and alkaline earth metals and an anion which is a halogen or sulfur, a hydrophilic binder and a member of the group consisting of an oxidizing agent and a silver halide emulsion, with the proviso that if the oxidizing agent is used, the metal layer or metal support is silver and at least one of the metal salt electrolyte and oxidizing agent contains halide ions.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the coating contains a silver oxidizing agent and the metal is silver.
Claim 4
Dependent Claim
58 words
The process of claim 2 wherein the silver oxidizing agent is selected from the group consisting of KClCrO 3 , K 3 Fe(CN) 6 , KMnO 4 , K 2 Cr 2 O 7 , NH 4 VO 3 , (NH 4 ) 2 Ce(NO 3 ) 6 and Fe 2 (C 2 O 4 ) 3 .
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the metal layer is coated on a support.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the coating contains a silver halide emulsion.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein the metal salt electrolyte is selected from the group consisting of halides of ammonium, alkali and alkaline earth.
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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |