06201979 is referenced by 147 patents and cites 33 patents.

A chemical signal-impermeable mask is positioned in the electrolyte flow such that the mask is between a source of chemical signal and a working electrode which senses the chemical signal transported from the source (e.g., by diffusion). The configuration of the mask is such that the mask prevents substantially all chemical signal transport from the chemical signal source having a radial vector component relative to a plane of the mask and the catalytic face of the working electrode, thus allowing primarily only chemical signal transport that is substantially perpendicular to the place of the mask and the catalytic surface of the working electrode. By reducing or eliminating chemical signal radial transport toward the working electrode, the mask thus significantly reduces or eliminates edge effects. By substantially reducing edge effects created by radial transport of chemical signal, it is possible to obtain a more accurate measurement of the amount (e.g., concentration) of chemical signal that is transported from a given area of source material.

Title
Chemical signal-impermeable mask
Application Number
9/523826
Publication Number
6201979 (B1)
Application Date
March 13, 2000
Publication Date
March 13, 2001
Inventor
Michael Tierney
San Jose
CA, US
Janet Tamada
Belmont
CA, US
Ronald T Kurnik
Forest City
CA, US
Agent
Robins & Associates
US
Agent
Barbara G McClung
US
Assignee
Cygnus
CA, US
IPC
A61B 5/07
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