Document VjVrgrB109G33kOYdxe0jeON

' United States Patent 4,173,681 Scories Glass balls Zirconium silicate MISCELLANEOUS Calcium aluminate Potassium bichromate Anti-oxidizings (agente) Carbon black Wood flour 5-20 Petroleum coke Lime Coal Chalk, kaolin, marble powder Clays Talc Lead formiate SOLVENTS Water Aromatics Aliphatics 0-10 Chlorinated Alcohols Ketones Page 6 of 8 For backplates we are using mixes of organic materials with the following composition. % BY WT FIBERS Asbestos 7D - 5K - 5R 10-60 Glass, silica, boron and ceramic fibers Graphite and carbon fibers Chopped asbestos cloth, asbestos threads (single or multiple) Metallic fibers Textile fibers (natural or synthetic) RESINS Formophenolic resins, modified or unmodi fied from straight phenol or substi tuted phenols 5-40 Formol urea, melamines, other nitrogenous resins Resins from aldehydes other than formol (furfural, benzaldehyde, croton- aldehyde) Thermostable resins other than phenolic resins (polyimides, polyesterimides, polyamide-imide, polybenzimidazole, polyphenilsulfide, polycarbonates, polyamides, polyesters) RUBBERS Natural 0-30 30% styrene + 70% butadiene Nitriles and acrylonitriles Butyl http //path uspto gov/netacgi/nph-Parser?Sectl =PT02&Sect2=HIT0FF&u=/netahtml/sea 10/18/2003