US4450842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state reference electrode
Assignee: Cordis Corp
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Filing: 1981-11-06
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Granted: 1984-05-29
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Expires: 2001-11-06
Abstract
Abstract In the reference electrode construction disclosed herein, silver and silver chloride particles are incorporated in a mixture including a fusible glass frit. After being printed on a suitable substrate, the mixture is fired to bond the silver/silver chloride composite into a conductive film on the surface of the substrate.
Inventors
- 👤 Gregory L. Zick
- 👤 Stanley H. Saulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:53
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/301; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A solid state sensor for measuring the oxygen of blood by contact with a patient's skin, said sensor comprising: a thin ceramic substrate disc having front and back surfaces; a noble metal cathode, extending through said substrate from the back surface to the front surface where, at a first limited area of said front surface, said cathode is exposed for reducing oxygen; and a reference electrode comprising a mixture of silver, silver chloride and a fused glass frit forming a conductive film coating over a second limited area of said disc front surface.
Claim 2
Dependent Claim
93 words
A solid state sensor for measuring the oxygen of blood by contact with a patient's skin, said sensor comprising: a thin ceramic substrate disc having front and back surfaces; a noble metal cathode, extending through said substrate from the back surface to the front surface where, at a first limited area of said front surface, said cathode is exposed for reducing oxygen; and a reference electrode comprising a mixture of silver, silver chloride and a fused glass frit forming a conductive film coating over a second limited area of said disc front surface.
Claim 3
Dependent Claim
28 words
The solid state sensor of claim 1 additionally comprising a heating element printed onto a first limited area of said back surface as a coating of resistor material.
Claim 4
Dependent Claim
21 words
The solid state sensor of claim 2 additionally comprising a thermistor printed onto a second limited area of said back surface.
Claim 5
Dependent Claim
21 words
The solid state sensor of claim 3 wherein said heating element and said thermistor are annular-shaped coatings on said back surface.
Claim 6
Dependent Claim
21 words
The solid state sensor of claim 1, 3 or 4 wherein said front surface is covered with an oxygen-permeable polymer coating.
Claim 7
Dependent Claim
24 words
The solid state sensor of claim 1, 3 or 4 wherein said reference electrode is an annular-shaped area of a film of said mixture.
Claim 8
Dependent Claim
27 words
The solid state sensor of claim 1, 3 or 4 wherein at least one of said silver and silver chloride are in the form of plate-like particles.
References Cited (Backward Citations)
US3399667A
Cited
US3662745A
Cited
US3795239A
Cited
US4148305A
Cited
US4324257A
Cited
US4270543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |