US PATENT SUBCLASS 204 / 428
.~.~.~.~.~.~ With protective element

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.~.~.~.~.~.~ With protective element {1}
429  DF  .~.~.~.~.~.~.~> Protective element is a layer

DEFINITION

Classification: 204/428

With protective element:

(under subclass 427) Apparatus in which part of the sensor assembly to shield the remainder from the deleterious chemical or physical effects of the sample or atmospheric gas.

(1) Note. The protective element is typically a screen or perforate or slotted solid member but may also be an ablative material.

(2) Note. This subclass includes protective elements for the sensor, e.g., caps for the sensor end, as well as protective elements at the reference end, e.g., filters in the reference gas entryway, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

425, for fugitive protective elements for solid electrolyte containing sensors.