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Cathode in a layered circuit and electrochemical cell for a measurement of oxygen in fluids

  • US 5,246,576 A
  • Filed: 12/10/1990
  • Issued: 09/21/1993
  • Est. Priority Date: 12/10/1990
  • Status: Expired due to Term
First Claim
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1. An improved electrochemical cell that is useful in an oxygen sensor that measures the oxygen tension or concentration in a fluid including those that have small quantities of oxygen where the cell is part of a printed wiring board, comprising:

  • a nonconducting substrate,at least one metallic layer overlying the said nonconducting substrate in a pattern to provide distinct cathode and anode and conductive pathways to both electrodes where the pathways are electrically isolated from each other and where they allow for eventual external electrical connection to the cell,an encapsulant layer overlying that portion of said metallic layer other than the anode to electrically isolate the conductive pathway to the anode from the conductive pathway to the cathode in the metallic layer and having at least one laser-produced finite-sided opening with a bottom and tapered walls, where the opening extends through at least said encapsulant layer, where at least a portion of the walls of said opening are formed by the encapsulant layer, where the opening exposes a portion of the metallic layer to act as a cathode, and where the opening is capable of ionic contact, andan electrolyte to provide ionic contact with the cathode and the anode for electrical ionic relationship between the electrodes.

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