US PATENT SUBCLASS 434 / 328
.~.~ Involving heat or chemical reaction

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

322  DF  QUESTION OR PROBLEM ELICITING RESPONSE {8}
327  DF  .~ Correctness of response indicated to examine by self-operating or examinee actuated means {12}
328.~.~ Involving heat or chemical reaction

DEFINITION

Classification: 434/328

Involving heat or chemical reaction:

(under subclass 327) Subject matter wherein the correctness of the examinee's response is revealed by means of thermal energy or a chemical transformation.