Patents by Inventor Yoshitaka Kawahara

Yoshitaka Kawahara 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).

  • Process for producing 5-alkylidenenorbornene
    Patent number: 4861931
    Abstract: A process for producing a 5-alkylidenenorbornene, which comprises contacting a 5-alkenylnorbornene with an organolithium compound and at least one compound selected from the group consisting of ammonia, a hydrazine compound and an aliphatic amine compound wherein at least one nitrogen atom in the molecule bonds to at least one hydrogen atom to isomerize the 5-alkenylnorbornene. This process enables the easy and efficient production of a 5-alkylidenenorbornene from an easily available raw material.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: August 29, 1989
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventors: Yasuo Hara, Ryuji Oashi, Yoshitaka Kawahara, Mikio Takeuchi