Patents Assigned to Shamrock Group
  • Ceramic proppants
    Patent number: 9434873
    Abstract: A sintered, generally spherical ceramic body, having an alumina content of from about 52 to about 55 weight percent distributed substantially homogeneously throughout the body, a silica content from about 32 to about 38 weight percent distributed substantially homogeneously throughout the body, an apparent specific gravity of about 2.61 to about 2.65, and a bulk density of about 1.45 to about 1.56 grams per cubic centimeter.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: September 6, 2016
    Assignee: Shamrock Group
    Inventors: Frank O'Brien, Chris Heller
  • Ceramic proppants
    Patent number: 8722590
    Abstract: A sintered, generally spherical ceramic body, having an alumina content of from about 52 to about 58 weight percent distributed substantially homogeneously throughout the body, a silica content from about 32 to about 39 weight percent distributed substantially homogeneously throughout the body, an apparent specific gravity of about 2.63 to about 2.67, and a bulk density of about 1.48 to about 1.56 grams per cubic centimeter.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: May 13, 2014
    Assignee: Shamrock Group
    Inventors: Frank O'Brien, Chris Haller