Patents by Inventor Robert W. Andrews

Robert W. Andrews 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).

  • Fluid cracking catalyst and method of making same from waste catalyst manufacture fines
    Patent number: 4699893
    Abstract: An improved process for ion-exchanging sodium ions in particles containing sodium form zeolite crystals and sodium silicate. The process involves an initial ion-exchange at pH about 4.5 to 5.0 with an ammonium salt followed by exchange with an ammonium salt at about pH 2.0 to 3.5. Cracking catalysts having improved cracking activity are produced.
    Type: Grant
    Filed: December 20, 1985
    Date of Patent: October 13, 1987
    Assignee: Engelhard Corporation
    Inventors: Robert W. Andrews, Francis L. Himpsl, Barry K. Speronello
  • Fluid cracking catalyst and method of making same from waste catalyst manufacture fines
    Patent number: 4581340
    Abstract: Co-product fines from the manufacture of zeolitic cracking catalysts from microspheres of calcined clay have heretofore been discarded as a waste stream. These fines, recovered as a moist cake, are slurried in a sodium silicate solution, spray dried to form microspheres and ion-exchanged initially at high pH and then at lower pH to produce attrition-resistant cracking catalysts which produce low levels of coke during use.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: April 8, 1986
    Assignee: Engelhard Corporation
    Inventors: Francis L. Himpsl, Robert W. Andrews, Barry K. Speronello
  • Cracking catalyst and manufacture thereof
    Patent number: 4520119
    Abstract: By-product fines from the manufacture of zeolitic cracking catalysts from microspheres of calcined clay have heretofore been discarded as a waste stream. These fines, recovered as a moist cake, are slurried in a sodium, silicate solution, spray dried to form microspheres and ion-exchanged to produce cracking catalysts which produce low levels of coke during use.
    Type: Grant
    Filed: September 15, 1983
    Date of Patent: May 28, 1985
    Assignee: Engelhard Corporation
    Inventors: Robert W. Andrews, Francis L. Himpsl, Eugene B. Horvath, Barry K. Speronello