Patents by Inventor William E. Leistner

William E. Leistner 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).

  • Inorganic and organic acid coester stabilizers
    Patent number: 4146517
    Abstract: New polyhydric phenol coesters are disclosed of polyhydric phenols, having 2 to 3 phenolic hydroxyl groups and 1 to 3 benzenoid rings, with carbonic acid and an inorganic acid which can be phosphorous acid, phosphoric acid, and boric acid. The new coesters have molecular weights from 700 to about 10,000, preferably from 1200 to 7000, and are highly effective stabilizers for a variety of synthetic resins.Stabilizer compositions comprising a polyhydric phenol coester and a known polymer stabilizer, as well as synthetic resins stabilized with such stabilizer compositions, are also disclosed.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: March 27, 1979
    Assignee: Argus Chemical Corporation
    Inventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Tohru Haruna
  • Carbonate ester stabilizers for polymers
    Patent number: 4104217
    Abstract: This invention relates to a new class of polyhydric phenol carbonate esters and to synthetic resin stabilizer compositions comprising these esters as well as to synthetic resins stabilized with such esters and with stabilizer compositions comprising these esters along with known polymer stabilizers.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: August 1, 1978
    Assignee: Argus Chemical Corporation
    Inventors: William E. Leistner, Motonobu Minagawa, Yutaka Nakahara, Tohru Haruna
  • 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