US4487679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Potassium ion-selective electrode
Assignee: Clinical Diagnostic Systems Inc
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Filing: 1984-03-15
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Granted: 1984-12-11
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Expires: 2004-03-15
Abstract
Abstract An improved potassium ion-selective electrode comprises a support having thereon a metal layer, a metal halide layer, an electrolyte layer and a potassium ion-selective membrane layer. The electrolyte layer comprises a mixture of salts, sodium halide and potassium halide at a weight ratio of sodium halide to potassium halide of 1:1 to 19:1, resulting in maintained precision and accuracy of results and improved adhesion between the electrolyte layer and adjacent layers. Preferably, the ratio of sodium halide to potassium halide in the electrolyte layer is approximately 3:1.
Inventors
- 👤 Daniel R. Stare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:35
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
139 words
In a dry-operative potassium ion-selective electrode comprising: (a) a dried internal reference electrode comprising a metal/metal salt reference electrode, said reference electrode comprising a conductive layer of a metal in contact with a layer of an insoluble salt of a metal, and a dried electrolyte layer comprising the dried residue of a water soluble salt having, as an anion, the anion of said metal salt layer and a hydrophilic polymeric binder in a solvent for the polymer and salt; and (b) in contact with the reference electrode a hydrophobic ion-selective membrane of predetermined uniform thickness in regions intended for contact with a sample for analysis, said membrane comprising an ion carrier dissolved in a carrier solvent; the improvement comprising a mixture of sodium halide and potassium halide in a weight ratio from 1:1 to 19:1 in said electrolyte layer.
Claim 2
Dependent Claim
139 words
In a dry-operative potassium ion-selective electrode comprising: (a) a dried internal reference electrode comprising a metal/metal salt reference electrode, said reference electrode comprising a conductive layer of a metal in contact with a layer of an insoluble salt of a metal, and a dried electrolyte layer comprising the dried residue of a water soluble salt having, as an anion, the anion of said metal salt layer and a hydrophilic polymeric binder in a solvent for the polymer and salt; and (b) in contact with the reference electrode a hydrophobic ion-selective membrane of predetermined uniform thickness in regions intended for contact with a sample for analysis, said membrane comprising an ion carrier dissolved in a carrier solvent; the improvement comprising a mixture of sodium halide and potassium halide in a weight ratio from 1:1 to 19:1 in said electrolyte layer.
Claim 3
Dependent Claim
20 words
The electrode of claim 1, wherein the ratio of sodium halide to potassium halide in said electrolyte layer is 3:1.
Claim 4
Dependent Claim
14 words
The electrode of claim 1, wherein the halide in said electrolyte layer is chloride.
Claim 5
Dependent Claim
11 words
The electrode of claim 1, wherein the ion carrier is valinomycin.
Claim 6
Dependent Claim
29 words
The electrode of claim 1, wherein the carrier solvent is selected from the group consisting of aromatic and aliphatic ethers, phosphonates and phosphates and mixtures thereof, phthalates and sebacates.
Claim 7
Dependent Claim
11 words
The electrode of claim 1 wherein the carrier solvent is diisodecylphthalate.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |