Patents by Inventor Takao Imachi

Takao Imachi 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).

  • Removal of heavy metals from waste water
    Patent number: 4731187
    Abstract: A heavy metal can be removed from waste water, in which the metal is contained as ions, by adding to the waste water a metal scavenger together with at least one of sodium monosulfide, sodium polysulfides and sodium hydrogensulfide to form a metal ion containing floc. The resulting floc is then removed from the waste water by filtration. The metal scavenger contains at least one carbodithio group and/or at least one carbodithioate salt group as N-substituents per molecule.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: March 15, 1988
    Assignee: Miyoshi Yushi Kabushiki Kaisha
    Inventors: Masafumi Moriya, Kazuo Hosoda, Akira Nishimura, Takao Imachi
  • Metal scavenger and metal scavenging process
    Patent number: 4670160
    Abstract: A metal scavenger is composed of an addition product of a polyamine and an epihalohydrin. The addition product contains as substituent or substituents at least one carbodithio group and/or at least one carbodithioate salt group introduced therein by substituting the corresponding number of active hydrogen atom or atoms in the addition product. Metals can be scavenged from waste water by adding the metal scavenger together with at least one of sodium monosulfide, sodium polysulfides and sodium hydrogensulfide.
    Type: Grant
    Filed: September 11, 1986
    Date of Patent: June 2, 1987
    Assignee: Miyoshi Yushi Kabushiki Kaisha
    Inventors: Masafumi Moriya, Kazuo Hosoda, Akira Nishimura, Takao Imachi
  • Metal scavenger and metal scavenging process
    Patent number: 4670180
    Abstract: A metal scavenger is composed of an addition product of a polyamine and an epihalohydrin. The addition product contains as substituent or substituents at least one carbodithio group and/or at least one carbodithioate salt group introduced therein by substituting the corresponding number of active hydrogen atom or atoms in the addition product. Metals can be scavenged from waste water by adding the metal scavenger together with at least one of sodium monosulfide, sodium polysulfides and sodium hydrogensulfide.
    Type: Grant
    Filed: April 18, 1986
    Date of Patent: June 2, 1987
    Assignee: Miyoshi Yushi Kabushiki Kaisha
    Inventors: Masafumi Moriya, Kazuo Hosoda, Akira Nishimura, Takao Imachi