US PATENT SUBCLASS 204 / 429
.~.~.~.~.~.~.~ Protective element is a layer

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

193  DF  APPARATUS {5}
194  DF  .~ Electrolytic {11}
400  DF  .~.~ Analysis and testing {20}
421  DF  .~.~.~ Solid electrolyte {2}
424  DF  .~.~.~.~ Gas sample sensor {3}
427  DF  .~.~.~.~.~ With gas reference material {1}
428  DF  .~.~.~.~.~.~ With protective element {1}
429.~.~.~.~.~.~.~ Protective element is a layer

DEFINITION

Classification: 204/429

Protective element is a layer:

(under subclass 428) Apparatus in which the protective

element is an adherent layer on the surface of the sensor assembly.

(1) Note. This subclass would include a layer of material impregnated with a getter for catalyst poisons.