71583762
Aug 20, 1949
Aug 21, 1951
MINERAL SUBSTANCES COMPOSED PRINCIPALLY OF ALUMINUM SILICATE WHICH HAVE BEEN HYDRO-THERMALLY ALTERED SO AS TO BE EXTREMELY SOFT AND CHARACTERIZED BY HAVING LITTLE, IF ANY, WATER OF CRYSTALLIZATION PRESENT USED AS AN EXTENDER IN PAINTS, RUBBER, ASPHALTS, INSECTICIDES, PHONOGRAPH RECORDS, PLASTICS, AND THE LIKE
Chemicals