Patents by Inventor Elbert A. Willis

Elbert A. Willis 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).

  • Sprayable plastic refractory
    Patent number: 4952534
    Abstract: A gunnable plastic refractory is made by adding a hydrocolloid, for example a polysaccharide ether such as methylcellulose, to the refractory composition and adjusting the moisture content to be from about 4% to about 10%. The workability index of the refractory mix is from about 8% to about 30%. The refractory can be gunned without stoppages caused by clogging of hoses and the rebound rate is low.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: August 28, 1990
    Assignee: A. P. Green Industries, Inc.
    Inventors: Allen R. Davis, Elbert A. Willis
  • Sprayable plastic refractory
    Patent number: 4810537
    Abstract: A gunnable plastic refractory is made by adding a polysaccharide ether such as methylcellulose to the refractory composition and adjusting the moisture content to be from about 4% to about 10%. The workability index of the refractory mix is from about 8% to about 30%. The refractory is gunned without stoppages caused by clogging of hoses and the rebound rate is low.
    Type: Grant
    Filed: November 9, 1977
    Date of Patent: March 7, 1989
    Assignee: A. P. Green Industries, Inc.
    Inventors: Allen R. Davis, Elbert A. Willis