Patent US4950379A successfully refreshed from Google Patents.
US4950379A
Expired / Lapsed
US
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Polarographic cell
Assignee: Nova Biomedical Corp
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Filing: 1989-10-02
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Granted: 1990-08-21
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Expires: 2009-10-02
Abstract
Abstract A two electrode assembly in a polarographic cell includes a sensor electrode and a silver/silver chloride reference electrode in which silver metal is in contact with a substantial reservoir of silver chloride.
Inventors
- 👤 Chung C. Young
- 👤 James E. Fowler
- 👤 Alan R. Silverman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:31
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0093; C; C12; C12Q; C12Q1/00; C12Q1/001; C12Q1/005; C12Q1/006; Y; Y10; Y10S; Y10S435/00; Y10S435/817
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A polarographic cell comprising a sensor electrode and a reference electrode, said reference electrode being a silver/silver chloride electrode comprising a ring of silver metal in contact with a concentric ring of silver chloride that has a thickness of at least 25μ, said reference electrode being capable of serving as a counter electrode to complete an electric circuit with said sensor electrode, a sufficient quantity of silver chloride being present so that 2,000 assays can be performed where the current used in each assay is 5 nanoamps and the length of each assay is 60 seconds. wherein during the operation of said electrode assembly, current flows through said electric circuit and the silver ion from said silver chloride is reduced to silver metal, said cell being connected to means for measuring said current, and wherein said polarographic cell lacks a third electrode.
Claim 2
Dependent Claim
142 words
A polarographic cell comprising a sensor electrode and a reference electrode, said reference electrode being a silver/silver chloride electrode comprising a ring of silver metal in contact with a concentric ring of silver chloride that has a thickness of at least 25μ, said reference electrode being capable of serving as a counter electrode to complete an electric circuit with said sensor electrode, a sufficient quantity of silver chloride being present so that 2,000 assays can be performed where the current used in each assay is 5 nanoamps and the length of each assay is 60 seconds. wherein during the operation of said electrode assembly, current flows through said electric circuit and the silver ion from said silver chloride is reduced to silver metal, said cell being connected to means for measuring said current, and wherein said polarographic cell lacks a third electrode.
Claim 3
Dependent Claim
18 words
The electrode assembly of claim 1 wherein said ring of silver chloride is at least 0.01 cm thick.
Claim 4
Dependent Claim
18 words
The electrode assembly of claim 1 wherein said ring of silver chloride is less than 0.5 cm thick.
Claim 5
Dependent Claim
23 words
The electrode assembly of claim 1, 2, or 3 wherein said silver chloride ring extends for the entire height of said silver ring.
Claim 6
Dependent Claim
25 words
The electrode assembly of claim 1 wherein said sensor electrode is disposed inside of said ring of silver chloride and said ring of silver metal.
Claim 7
Dependent Claim
22 words
The electrode assembly of claim 5, further comprising a laminated membrane covering the exposed faces of said sensor and said reference electrodes.
Claim 8
Dependent Claim
39 words
The electrode assembly of claim 6 wherein said laminated membrane comprises an inner membrane adjacent said exposed faces of said sensor and said reference electrodes; an outer solution-contacting membrane; and an adhesive layer between said membranes holding them together.
Claim 9
Dependent Claim
17 words
The electrode assembly of claim 7 wherein said adhesive layer comprises an enzyme and a binding agent.
Claim 10
Dependent Claim
30 words
The electrode assembly of claim 8 wherein said assembly is for use in assaying a substance and wherein said enzyme is capable of oxidizing said substance to generate hydrogen peroxide.
Claim 11
Dependent Claim
19 words
The electrode assembly of claim 1, further comprising a laminated membrane covering the exposed faces of said sensor electrode.
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |