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Extended use planar sensors

  • US 5,518,601 A
  • Filed: 08/24/1995
  • Issued: 05/21/1996
  • Est. Priority Date: 04/09/1993
  • Status: Expired due to Term
First Claim
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1. A method for forming a microelectrode for use as a working electrode in a planar, solid-state sensor or the like, comprising the steps of:

  • selecting an electrically nonconductive substrate,combining said substrate with an electrically conductive material with said electrically conductive material forming a layer adjacent said electrically nonconductive substrate,coating at least a portion of the electrically conductive material with an electrically insulating material,puncturing the electrically insulating material to form at least one hole or opening therein with a needle in communication with electric circuit means in communication with the electrically conductive material, which moves between a first position and a second position in which the electric circuit means generates a signal;

    withdrawing the needle when the signal is generated;

    said insulating material being selected to firmly adhere to the conductive material such that when the at least one hole or opening is formed, an exposed, electrically addressable portion of the electrically conductive material is created, defining at least one electrode having a size defined by the cross-sectional area of the hole or opening.

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