US4250010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated ion selection electrode device
Assignee: Fujifilm Holdings Corp
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Filing: 1979-10-24
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Granted: 1981-02-10
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Expires: 1999-10-24
Abstract
Abstract An ion selection electrode device for measuring concentrations of predetermined ions such as in biological samples in which measuring electrodes are disposed on a planar substrate with their active heads lying within a circle of small radius. A small sample of a liquid to be measured is dropped on and spreads over the circle contacting each electrode. In a preferred embodiment, two sets of electrodes are provided around adjacent circles on a single substrate, one for the sample and the other for a standard reference fluid. A dam separates the two liquids but electrical contact therebetween is provided by a porous bridge.
Inventors
- 👤 Asaji Kondo
- 👤 Masao Kitajima
- 👤 Isamu Hatanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:54
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
An ion selection electrode device comprising: a supporting board having an electrically insulating surface; a plurality of pairs of electrodes, each of said pairs being arranged on said supporting board, a first electrode of each of said pairs of electrodes having a head thereof positioned within a first circle and a second electrode of each of said pairs of electrodes having a head thereof positioned within a second circle, each of said electrodes comprising, in order, a metal substrate laminated with a layer of a non-water-soluble salt of said metal, an electrolytic layer containing anions in common with said non-water-soluble salt, and an ion selection membrane, each electrode of said pairs of electrodes having a like ion selection membrane and the ion selection membranes being different between at least some of said pairs of electrodes; a non-water-permeable and electrically insulating membrane covering each of said electrodes with only said ion selection membranes exposed; an insulating ridge positioned between said two circles; and a bridge of porous material extending over said ridge.
Claim 2
Dependent Claim
171 words
An ion selection electrode device comprising: a supporting board having an electrically insulating surface; a plurality of pairs of electrodes, each of said pairs being arranged on said supporting board, a first electrode of each of said pairs of electrodes having a head thereof positioned within a first circle and a second electrode of each of said pairs of electrodes having a head thereof positioned within a second circle, each of said electrodes comprising, in order, a metal substrate laminated with a layer of a non-water-soluble salt of said metal, an electrolytic layer containing anions in common with said non-water-soluble salt, and an ion selection membrane, each electrode of said pairs of electrodes having a like ion selection membrane and the ion selection membranes being different between at least some of said pairs of electrodes; a non-water-permeable and electrically insulating membrane covering each of said electrodes with only said ion selection membranes exposed; an insulating ridge positioned between said two circles; and a bridge of porous material extending over said ridge.
Claim 3
Dependent Claim
22 words
The ion selection electrode device of claim 1 wherein the radius of each of said circles is no greater than 2 cm.
Claim 4
Dependent Claim
84 words
The ion selection electrode device of either claim 1 or 2 further comprising: electrical connection means coupled to each of said electrodes; and two switch means, a first one of said switch means being coupled to said first electrodes of said pairs of electrodes and a second one of said switch means being coupled to said second electrodes of said pairs of electrodes, said two switches coupling a selected pair of electrodes to external utilization means, said switches operating in parallel with one another.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |