Patents by Inventor Norman W. Hall

Norman W. Hall 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