(under subclass 17.1) Processes combined with the step of forming pores or open cells in situ within a glass composition by a gas forming agent during or subsequent to the formation of a glass product.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20, for processes of foaming slag in situ to form a cellular product.
141, for melt disintegrating or puffing means including fluid-melt contacting means.
SEE OR SEARCH CLASS
156, Adhesive Bonding and Miscellaneous Chemical Manufacture,
77+, for a process of bonding lamina including the step of forming pores in situ within a lamina. 264, Plastic and Nonmetallic Article Shaping or Treating: Processes,
41+, for processes under the class definition, which include a pore forming in situ step.
501, Compositions: Ceramic,
39, for processes of forming pores or open cells with a glass melt not combined with specific glass working and/or treating. The line between this class (501) and Class 65 on patents claiming the combination or pore-forming and broad glass working and/or treating is stated in the class definitions of Class 65.
521, Synthetic Resins or Natural Rubbers,
50+, for processes directed to the production of porous or cellular resinous bodies.
