Patents by Inventor Jian J. Zhang

Jian J. Zhang 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 alkyl ketene dimers by dimerization with tertiary amines
    Patent number: 5525738
    Abstract: A process is disclosed for the synthesis of alkyl ketene dimers by the dehydrohalogenation of a C.sub.8 -C.sub.22 saturated or unsaturated linear fatty acid halide, comprising reacting the fatty acid chloride with a cyclic tertiary amine in a solvent that is selected from the group consisting of cycloalkanes and alkanes at a temperature of up to 75.degree., mechanically separating tertiary amine hydrochloride salts from alkyl ketene dimer dissolved in the solvent, and recovering the alkyl ketene dimer from the solvent.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: June 11, 1996
    Assignee: Hercules Incorporated
    Inventor: Jian J. Zhang
  • High cooling air flow rate brake rotor
    Patent number: 5492205
    Abstract: A brake rotor exhibits improved air flow cooling characteristics and includes an optimum number of vanes, a passage profile designed to reduce flow restrictions and an alternate longer-shorter vane configuration to accommodate the rotor air flow regime.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: February 20, 1996
    Assignee: General Motors Corporation
    Inventor: Jian J. Zhang