US PATENT SUBCLASS 432 / 7
.~.~ Forming a permeable layer or sheet

Current as of: June, 1999
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432 /   HD   HEATING

1  DF  PROCESSES OF HEATING OR HEATER OPERATION {14}
5  DF  .~ Including preparing or arranging work for heating {2}
7.~.~ Forming a permeable layer or sheet

DEFINITION

Classification: 432/7

(under subclass 5) Process in which the arranging of the work material includes spreading out particulate material to form a porous sheet of relatively small transverse dimension.