US5021140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-selective electrode
Assignee: Fujifilm Holdings Corp
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Filing: 1989-01-10
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Granted: 1991-06-04
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Expires: 2009-01-10
Abstract
Abstract An ion-selective electrode comprises a non-conductive support, an inner reference electrode and an ion-selective layer mounted in this order. A surface of the ion-selective layer is covered with a material which forms a contact angle of at least 90 DEG with water. By this material, the surface area over which a test liquid comes into contact with the ion-selective layer is reduced.
Inventors
- 👤 Takehiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:12
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/307
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
An ion-selective electrode comprising a non-conductive support, a sheet inner reference electrode formed on said support, said inner reference electrode comprising a conductive metal layer mounted on said support, and a layer containing a water-insoluble salt of said metal which layer is mounted on said conductive metal layer, a halide ion-selective layer formed on said inner reference electrode, and a material which forms a contact angle of at least 90° with water, a surface of said ion-selective layer being covered with said material.
Claim 2
Dependent Claim
83 words
An ion-selective electrode comprising a non-conductive support, a sheet inner reference electrode formed on said support, said inner reference electrode comprising a conductive metal layer mounted on said support, and a layer containing a water-insoluble salt of said metal which layer is mounted on said conductive metal layer, a halide ion-selective layer formed on said inner reference electrode, and a material which forms a contact angle of at least 90° with water, a surface of said ion-selective layer being covered with said material.
Claim 3
Dependent Claim
14 words
An ion-selective electrode as defined in claim 1 in which said halide is chloride.
Claim 4
Dependent Claim
31 words
An ion-selective electrode as defined in claim 1 in which said material is selected from a group consisting of higher hydrocarbons, fatty acids, higher alcohols, perfluoro fatty acids and polysiloxane compounds.
Claim 5
Dependent Claim
31 words
An ion-selective electrode as defined in claim 1 in which said material is selected from a group consisting of paraffin, vaseline, stearic acid, palmitic acid, behenic acid, 2-pentadecanoic acid and 1-eicosanol.
Claim 6
Dependent Claim
27 words
An ion-selective electrode as defined in claim 1 in which said material has a thickness falling within the range of about 0.01 μm to about 2 μm.
Claim 7
Independent Claim
117 words
A device for determining ionic activity level comprising an ion-selective electrode pair, a first porous member for supplying a test liquid to a first electrode of said ion-selective electrode pair, a second porous member for supplying a reference liquid to a second electrode of said ion-selective electrode pair, a porous bridge for connecting said liquids so that an electric current will flow through said test liquid and said reference liquid, respectively supplied to said first and second electrodes, and a material which forms a contact angle of at least 90° with water, said material covering a surface of at least one of said electrodes and wherein at least one of said electrodes is a halide ion-selective electrode.
Claim 8
Independent Claim
117 words
A device for determining ionic activity level comprising an ion-selective electrode pair, a first porous member for supplying a test liquid to a first electrode of said ion-selective electrode pair, a second porous member for supplying a reference liquid to a second electrode of said ion-selective electrode pair, a porous bridge for connecting said liquids so that an electric current will flow through said test liquid and said reference liquid, respectively supplied to said first and second electrodes, and a material which forms a contact angle of at least 90° with water, said material covering a surface of at least one of said electrodes and wherein at least one of said electrodes is a halide ion-selective electrode.
Claim 9
Dependent Claim
18 words
A device for determining ionic activity level as defined in claim 6 in which said halide is chloride.
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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) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |