Patents by Inventor Ronald M. Kotschi

Ronald M. Kotschi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of making silica sand molds and cores for metal founding
    Patent number: 5911269
    Abstract: Thermal expansion defects, i.e. veining, are reduced in iron, steel, and nonferrous castings by adding a lithia-containing material in a sufficient amount to the silica sand mold to provide about 0.001% to about 2.0% of lithia. The addition of lithia is accomplished by adding lithium bearing minerals such as .alpha.-spodumene, amblygonite, montebrasite, petalite, lepidolite, zinnwaldite, eucryptite or lithium carbonate.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: June 15, 1999
    Assignee: Industrial Gypsum Co., Inc.
    Inventors: John J. Brander, Ronald M. Kotschi