(under subclass 603) Process for treating an article expressed or claimed as having small open or interconnected randomly distributed microvoids or producing an article expressed or claimed as having small open or interconnected randomly distributed microvoids by uniting particulate material.
(1) Note. Impregnating a porous preform (e.g., sponge, etc.) with inorganic material followed by sintering outside of the mold to cause formation of a porous inorganic body while decomposing the preform which acts as a shaping surface is proper under this subclass.
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41+, for in situ processes of internally forming pores or voids in an article or material by intentionally occluding or incorporating void forming or void producing elements or ingredients randomly throughout the plastic forming material.
(1) Note. Thus, incorporating particulate organic material in an inorganic forming material with subsequent burning decomposition of the particulate organic material to form random pores in an inorganic product would be proper under subclass 44, hereinabove.
317, for processes generally which involves the destruction of material which may leave a space or void.
321, for processes of reshaping previously foamed material.
