Patents by Inventor David S. Hacker

David S. Hacker 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).

  • By-product recovery when oxidizing polymethylbenzenes to polycarboxylic acids
    Patent number: 5118838
    Abstract: Substantial proportions of methyl acetate and unreacted polymethylbenzene are recovered from the waste gas produced during the oxidation of a polymethylbenzene to its corresponding polycarboxylic acid by passing the waste gas, after being cooled for removal of water vapor, through at least one bed of activated carbon and subsequently desorbing the methyl acetate and polymethylbenzene from the bed by passing a desorbing medium, such as steam, through the bed. Preferably, the cooled stream is heated to a temperature of at least 21.degree. C. (70.degree. F.) prior to being passed into the bed of activated carbon.There is also disclosed an improved process for the oxidation of a polymethylbenzene to its corresponding aromatic polycarboxylic acid, which process comprises producing the polycarboxylic acid and waste gas comprising methyl acetate, water vapor, and unreacted polymethylbenzene and treating the waste gas according to the above method.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: June 2, 1992
    Assignee: Amoco Corporation
    Inventors: Martin A. Zeitlin, David S. Hacker, Kristi A. Fjare, Diane J. Graziano, Stacey L. Kissinger
  • Photochemical process for the preparation of disilane
    Patent number: 4604274
    Abstract: Silane is efficiently converted to disilane by irradiation at pressures in excess of about 75 torr using pulsed coherent light having a wavelength in the range from about 10.2 to about 11.2 .mu.m.
    Type: Grant
    Filed: July 18, 1985
    Date of Patent: August 5, 1986
    Assignee: Amoco Corporation
    Inventors: Joshua Zavelovich, David S. Hacker