Patents by Inventor Ted R. Crego

Ted R. Crego 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).

  • Yttria-zirconia slurries and mold facecoats for casting reactive metals
    Patent number: 5464797
    Abstract: The disclosure describes an aqueous ceramic slurry having from about 70-weight percent to about 85 weight-percent of a fused yttria-zirconia material. The weight percent of zirconia in the fused yttria-zirconia preferably varies from about 1.0 weight percent to about 10.0 weight percent. Fused slurries may comprise, in addition to fused yttria-zirconia, an inorganic binder (preferably silica), an organic binder (preferably a latex binder), a surfactant (preferably a sodium dioctyl sulfosuccinate), an antifoaming agent (preferably a water-dilutable active silicone defoamer) and titanium dioxide. The slurries of the present invention are used to form ceramic mold facecoatings for casting reactive materials. These slurries are less sensitive to pH fluctuations than are slurries made from 100 percent yttria (yttria slurries). Moreover, slurries as described in the disclosure do not gel prematurely, and exhibit substantially the same formation of oxygen-enriched titanium (alpha case) than do yttria slurries.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: November 7, 1995
    Assignee: Precision Castparts Corporation
    Inventors: Mehrdad Yasrebi, William W. Kemp, David H. Sturgis, Douglas G. Nikolas, Gary L. Wright, Thomas J. Kelly, III, Mark E. Springgate, Ted R. Crego
  • Yttria-zirconia slurries and mold facecoats for casting reactive metals
    Patent number: 5407001
    Abstract: The disclosure describes an aqueous ceramic slurry having from about 70-weight percent to about 85 weight-percent of a fused yttria-zirconia material. The weight percent of zirconia in the fused yttria-zirconia preferably varies from about 1.0 weight percent to about 10.0 weight percent. Fused slurries may comprise, in addition to fused yttria-zirconia, an inorganic binder (preferably silica), an organic binder (preferably a latex binder), a surfactant (preferably a sodium dioctyl sulfosuccinate), an antifoaming agent (preferably a water-dilutable active silicone defoamer) and titanium dioxide. The slurries of the present invention are used to form ceramic mold facecoatings for casting reactive materials. These slurries are less sensitive to pH fluctuations than are slurries made from 100 percent yttria (yttria slurries). Moreover, slurries as described in the disclosure do not gel prematurely, and exhibit substantially the same formation of oxygen-enriched titanium (alpha case) than do yttria slurries.
    Type: Grant
    Filed: July 8, 1993
    Date of Patent: April 18, 1995
    Assignee: Precision Castparts Corporation
    Inventors: Mehrdad Yasrebi, William W. Kemp, David H. Sturgis, Douglas G. Nikolas, Gary L. Wright, Thomas J. Kelly, III, Mark E. Springgate, Ted R. Crego