Patents by Inventor C. T. Cheng

C. T. Cheng 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).

  • Manufacture of high purity hydrogen peroxide by using reverse osmosis osmosis
    Patent number: 4879043
    Abstract: A reverse osmosis process for manufacturing highly-pure aqueous hydrogen peroxide. Membranes used are aromatic polyamides, polypiperazineamides, polysulfones or polyacrylonitriles.
    Type: Grant
    Filed: July 20, 1988
    Date of Patent: November 7, 1989
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John H. Boughton, Ralph A. Butz, Herman C. T. Cheng, Jonathan R. Dennis, Brian T. Hannon, Janet H. Weigel
  • Light grinding machine
    Patent number: D285929
    Type: Grant
    Filed: February 22, 1984
    Date of Patent: September 30, 1986
    Assignee: Rong Kuang Machinery Co. Ltd.
    Inventor: C. T. Cheng