Patents by Inventor Masahiro Kazigase

Masahiro Kazigase 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).

  • Phenolic chelate resin and method of adsorption treatment
    Patent number: 4250031
    Abstract: A phenolic chelate resin comprising the three-dimensional product obtained by cross-linking a phenolic compound represented by the general formula (I): ##STR1## (wherein M is an alkali metal atom, an ammonium group, or a hydrogen atom, and R.sub.1 and R.sub.2, which may be the same or different, each is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms) with a phenol and an aldehyde. The phenolic chelate resin selectively adsorbs ferric ion and/or cupric ion in an acidic aqueous solution at a pH of 3 and less.
    Type: Grant
    Filed: September 18, 1979
    Date of Patent: February 10, 1981
    Assignee: Unitika Ltd.
    Inventors: Hiroyuki Uejima, Masahide Hirai, Masahiro Kazigase
  • Phenolic chelate resin and method of adsorption treatment
    Patent number: 4197391
    Abstract: A phenolic chelate resin comprising the three-dimensional product obtained by cross-linking a phenolic compound represented by the general formula (I): ##STR1## (wherein M is an alkali metal atom, an ammonium group, or a hydrogen atom, and R.sub.1 and R.sub.2, which may be the same or different, each is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms) with a phenol and an aldehyde. The phenolic chelate resin selectively adsorbs ferric ion and/or cupric ion in an acidic aqueous solution at a pH of 3 and less.
    Type: Grant
    Filed: March 1, 1978
    Date of Patent: April 8, 1980
    Assignee: Unitika Ltd
    Inventors: Hiroyuki Uejima, Masahide Hirai, Masahiro Kazigase
  • Phenolic chelate resin
    Patent number: 4028284
    Abstract: A high adsorption capacity phenolic chelate resin consisting of a heavy metal-adsorbing phenolic chelate resin, containing iminodiacetic acid groups in the phenol nuclei, and having an adsorbability to a heavy metal in the proportion of at least 1.2 m equivalent per g of dried terminal Na type resin, said phenolic chelate resin being prepared from phenols, aldehydes and iminodiacetic acid.
    Type: Grant
    Filed: September 11, 1975
    Date of Patent: June 7, 1977
    Assignee: Unitika Ltd.
    Inventors: Masahide Hirai, Mikio Fujimura, Masahiro Kazigase, Minoru Saito
  • Process of producing phenolic chelate resin using iminodiacetic acid
    Patent number: 3936399
    Abstract: A phenolic chelate resin having a high heavy-metal chelating ability and capable of being reused is produced by polycondensing a phenol containing an iminodiacetic acid group with an aldehyde.
    Type: Grant
    Filed: January 21, 1974
    Date of Patent: February 3, 1976
    Assignee: Unitika Ltd.
    Inventors: Masahide Hirai, Mikio Fujimura, Masahiro Kazigase, Minoru Saito