Patents by Inventor William R. Sawran

William R. Sawran 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).

  • Process for the manufacture of carbon fibers and feedstock therefor
    Patent number: 4671864
    Abstract: Disclosed herein is an improved pitch for making readily stabilizable, substantially nonmesophasic carbon fibers. The pitch has a softening point of about 250.degree. C.(480.degree. F.) or above and is produced from an unoxidized thermal petroleum pitch by selectively reducing or eliminating a portion of the low molecular weight materials in a very short period of time so that the tendency to produce mesophase pitch is eliminated or reduced and so that the chemical integrity of the components of the higher molecular weight fractions is preserved as much as possible. Also disclosed is a method of producing carbon fibers therefrom and rovings or mats from such fibers.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: June 9, 1987
    Assignee: Ashland Oil, Inc.
    Inventors: William R. Sawran, Frank H. Turrill, John W. Newman, Norman W. Hall, Clifford Ward
  • Process for the manufacture of carbon fibers
    Patent number: 4497789
    Abstract: Disclosed herein is an improved pitch for making readily stabilizable, substantially nonmesophasic carbon fibers. The pitch has a softening point of about 250.degree. C. (480.degree. F.) or above and is produced from an unoxidized thermal petroleum pitch by selectively reducing or eliminating a portion of the low molecular weight materials in a very short period of time so that the tendency to produce mesophase pitch is eliminated or reduced and so that the chemical integrity of the components of the higher molecular weight fractions is preserved as much as possible. Also disclosed is a method of producing carbon fibers therefrom and rovings or mats from such fibers.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: February 5, 1985
    Assignee: Ashland Oil, Inc.
    Inventors: William R. Sawran, Frank H. Turrill, John W. Newman, Norman W. Hall
  • Process for carbon electrode manufacture
    Patent number: 4307052
    Abstract: Disclosed is a carbon extrusion oil for preparing carbon and graphite electrodes. The composition comprises a mixture of straight-chain paraffin hydrocarbons and cylinder stock derived from a naphthenic type of crude oil. This invention relates to a method for producing extruded carbon or graphite bodies and to a composition for use therein.
    Type: Grant
    Filed: August 15, 1980
    Date of Patent: December 22, 1981
    Assignee: Ashland Oil, Inc.
    Inventors: Charles R. Gannon, William R. Sawran
  • Extrusion oil composition for carbon electrode manufacture
    Patent number: 4218305
    Abstract: Disclosed is a carbon extrusion oil for preparing carbon and graphite electrodes. The composition comprises a mixture of straight-chain paraffin hydrocarbons and cylinder stock derived from a naphthenic type of crude oil. This invention relates to a method for producing extruded carbon or graphite bodies and to a composition for use therein.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: August 19, 1980
    Assignee: Ashland Oil, Inc.
    Inventors: Charles R. Gannon, William R. Sawran