Patents by Inventor Gerald H. Spiegelman

Gerald H. Spiegelman 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).

  • Catalytic method for making pitch
    Patent number: 4202755
    Abstract: A method for making pitch from petroleum bottoms fractions by air blowing in the presence of about 1 percent by weight of metallic sodium. The method reduces processing time by about one-third and the product is of the desired high density of about 1.25 g/ml. to above 1.30 g/ml. at 25.degree. C.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: May 13, 1980
    Assignee: Witco Chemical Corp.
    Inventors: Gerald H. Spiegelman, Harry B. Nickles, Jack M. Solomon
  • Process for the preparation of dialkyltin dihalides
    Patent number: 4052427
    Abstract: The preparation of dialkyltin dihalides and mixed dialkyltin dihalides, by refluxing a dimethyltin dihalide with a higher alkyl-halide in the presence of a phosphonium iodide catalyst, useful as intermediates for PVC stabilizers.
    Type: Grant
    Filed: June 21, 1976
    Date of Patent: October 4, 1977
    Assignee: Witco Chemical Corporation
    Inventors: William E. Leistner, Gerald H. Spiegelman, Louis J. Hover