Patents by Inventor Leroy D. Hart

Leroy D. Hart 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).

  • Production of continuous ceramic fibers
    Patent number: 4071594
    Abstract: Thin continuous fibers or filaments of alumina or other ceramic or refractory materials are extruded, attenuated and wound from a slip comprising particles of the refractory or ceramic material and selected resins or binders comprising a high molecular weight linear chain polyethylene oxide polymer and an organic solvent. These fibers are then heated to provide a ceramically bonded refractory product.
    Type: Grant
    Filed: February 24, 1976
    Date of Patent: January 31, 1978
    Assignee: Aluminum Company of America
    Inventors: Alan Pearson, Leroy D. Hart
  • High strength alumina-silica catalyst substrates having high surface area
    Patent number: 3943064
    Abstract: Catalyst substrates characterized by superior structural properties and a subsequent high degree of catalytic activity are produced by using a blend of colloidal silica and specially activated alumina which blend is subsequently rehydrated and activated under certain specified conditions. In a preferred embodiment the substrate is activated at a temperature of 1200.degree.-1400.degree.C to provide a substrate characterized by the absence of free silica.
    Type: Grant
    Filed: July 11, 1974
    Date of Patent: March 9, 1976
    Assignee: Aluminum Company of America
    Inventors: Marlyn D. Ballain, Leroy D. Hart