US PATENT SUBCLASS 264 / 419
.~.~.~ Using chemical blowing agent

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

405  DF  DIRECT APPLICATION OF ELECTRICAL OR WAVE ENERGY TO WORK (E.G., ELECTROMAGNETIC WAVE, PARTICULATE, MAGNETIC, INDUCTION HEAT, SONIC, ELECTROSTATIC ENERGY, ETC.) {26}
413  DF  .~ Producing or treating porous product {5}
415  DF  .~.~ Including in situ (e.g., foaming) {3}
419.~.~.~ Using chemical blowing agent {2}
420  DF  .~.~.~.~> Microwave (e.g., 2.45 gigahertz, etc.)
421  DF  .~.~.~.~> Radio frequency (e.g., 13.56 megahertz, etc.)

DEFINITION

Classification: 264/419

Using chemical blowing agent:

(under subclass 415) Processes in which pores or voids are formed by the generation of a gas, by a chemical reaction of gas producing reactants, or by agents incorporated in the molding material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

54, for processes of forming voids or pores utilizing gas producing reactants without using directly applied electrical or wave energy.