Patents by Inventor Osamu Narukawa

Osamu Narukawa 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).

  • Method for selective isolation of Dichlorobenzene
    Patent number: 4873383
    Abstract: A selective isolation of m-dichlorobenzene is carried out at a high efficiency by bringing an isomeric mixture containing m- and o- and/or p-dichlorobenzenes into contact with an absorbing material comprising a TPZ-3 type zeolite consisting of at least one aluminosilicate compound of the formula (I):M.sub.2/n O.multidot.Al.sub.2 O.sub.3 .multidot..sub.x SiO.sub.2 .multidot..sub.m H.sub.2 O (I)wherein M = a mono or di-valent cation, for example, H.sup.+, Li.sup.+ or Na.sup.+, n=1 or 2, x=10 or more, and m=0 or 1 or more, to selectively absorb dichlorobenzene by the absorbing material, and then, by collecting the non-absorbed fraction of the isomeric mixture.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: October 10, 1989
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Toshitaka Kaneshiki, Osamu Narukawa, Tadayoshi Haneda, Toshiyuki Endo