Patents by Inventor Takashi Torikoshi

Takashi Torikoshi 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).

  • Organolithium polymerization initiators and their preparations
    Patent number: 4075253
    Abstract: A stable and non-polar solvent soluble alpha-methylstyrene-conjugated diene oligomer dilithium as a polymerization initiator is obtained by preparing a dilithium initiator solution by reacting lithium metal with alpha-methylstyrene in a polar solvent at low temperature, thereafter adding gradually a small amount of a conjugated diene to the dilithium initiator solution to consume completely the alpha-methylstyrene, and then adding additional conjugated diene in a certain amount so as to prepare the stable and non-polar solvent soluble alpha-methylstyrene-conjugated diene oligomer dilithium.
    Type: Grant
    Filed: May 15, 1975
    Date of Patent: February 21, 1978
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Shigeki Horiie, Shin-Ichiro Asai, Takashi Torikoshi, Kazuhiro Shirakawa, Minoru Handa