US PATENT SUBCLASS 65 / 21.4
.~.~ Hollow or porous particle

Current as of: June, 1999
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65 /   HD   GLASS MANUFACTURING

17.1  DF  PROCESSES {32}
21.1  DF  .~ Self-supporting particle making (e.g., bead, ball, granule, etc.) {4}
21.4.~.~ Hollow or porous particle

DEFINITION

Classification: 65/21.4

Hollow or porous particle:

(under subclass 21.1) Processes including the step of forming hollow spheres or forming pores or voids in particulate material.