34f08f34_rials_patent_application_class__Description
20140182809 07-03-2014 [Description] 
MULLITE-CONTAINING INVESTMENT CASTING CORE - An investment casting core includes a mullite-containing core body. The body can be made by providing a mullite-containing powder, forming the powder into a green body, and sintering the green body to form the mullite-containing core body.
Utilizing particular mold materials patent application class