Patents by Inventor Takashi Nishikaji

Takashi Nishikaji 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).

  • Adsorbent for optical resolution and resolution method employing it
    Patent number: 5096971
    Abstract: An adsorbent for optical resolution obtained by graft polymerizing an optically active vinyl monomer of the formula: ##STR1## wherein X is --CONH--, --COO-- or --NHCOO--, R.sup.1 is a hydrogen atom or a methyl group, and each of R.sup.2 to R.sup.4 which are different from one another, is a hydrogen atom, a hydrocarbon group or an alkoxycarbonyl group, or R.sup.2 and R.sup.3 together form a ring, to a crosslinked polymer carrier having groups to which said monomer is graft polymerizable.
    Type: Grant
    Filed: October 20, 1989
    Date of Patent: March 17, 1992
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Takashi Nishikaji, Hideaki Kiniwa, Tsunehiko Kurata
  • Process for preparing solid water soluble polymers
    Patent number: 4074041
    Abstract: An aqueous gel of a water-soluble polymer containing units of a quaternary ammonium salt of an alkylacrylate or a methacrylate is dehydrated by adding at least one salt of a divalent metal and a strong acid to said gel and then dehydrating said gel.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: February 14, 1978
    Assignees: Mitsubishi Chemical Industries Limited, Kyoritsu Yuki Co., Ltd.
    Inventors: Takashi Nishikaji, Kenzo Watanabe, Shigeru Sawayama