Patents by Inventor Claude Watts

Claude Watts 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).

  • Refractory containing investment material and method of making
    Patent number: 5310420
    Abstract: An improved refractory investment material for use in making refractory molds is provided. The material comprises an investment powder including a binder, a refractory selected from calcined mullite and pyrophyllite, additives for controlling setting and about 0.01 to about 0.04% by weight of a sulfate salt. The investment powder is formed into a slurry with a solution of a water based colloidal silica in an amount providing about 3% to about 6% by weight colloidal silica based on the weight of the water and a chloride salt in an amount of at least about 0.5% by weight based on the weight of said investment powder.
    Type: Grant
    Filed: September 21, 1992
    Date of Patent: May 10, 1994
    Assignee: Precision Metalsmiths, Inc.
    Inventor: Claude Watts