Back to results
US 4,592,824 AGranted
Miniature liquid junction reference electrode and an integrated solid state electrochemical sensor including the same
AssigneeCentre Suisse d'Electronique et de Microtechnique S.A.
InventorsRosemary L. Smith, Scott Collins
Life of this patent
Estimating the term…
Abstract
This invention relates to a miniature reference electrode of the liquid junction-type which is utilized by an integrated electrochemical sensor, which functions as an Ion Sensitive Field Effect Transistor.
Claims8
A miniature reference electrode providing both electrical connection and a liquid junction between a reference liquid solution and a solution to be tested, comprising:
- a substrate provided with a cavity to hold said reference liquid solution;
- a membrane comprising porous silicon closing a first end of said cavity;
- means for applying fixed control voltage to said reference liquid solution;
- and
- means for hermetically closing a second end of said cavity.
2 more elements
An integrated chemical sensor including an Ion Sensitive Field Effect Transistor formed in a silicon substrate and a miniature reference electrode on said silicon substrate, wherein said electrode comprises:
- a cavity provided in said silicon substrate to hold a reference liquid solutiion;
- a membrane comprising porous silicon, said membrane closing a first end of said cavity;
- means for applying a fixed control voltage to said reference liquid solution;
- and
- means for hermetically closing a second end of said cavity.
2 more elements
Dependencies are inferred from the claim text.