Patents Examined by Gary P. Stevens
  • Exhaust gas cleaner and method for cleaning same
    Patent number: 5658542
    Abstract: Nitrogen oxides are efficiently removed from an exhaust gas containing nitrogen oxides and an excess amount of oxygen, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising a first catalyst comprising 0.2-15 weight % (on a metal basis) of at least one silver salt selected from the group consisting of silver halides, silver sulfate and silver phosphate supported on a porous inorganic oxide on an inlet side and a second catalyst comprising (a) 0.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: August 19, 1997
    Assignee: Kabushiki Kaisha Riken
    Inventors: Kiyohide Yoshida, Gyo Muramatsu, Akira Abe, Naoko Irite