Patents by Inventor Ritaro Saito

Ritaro Saito 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 of and apparatus for removing nitrogen oxides from the gases containing nitrogen oxides
    Patent number: 4199554
    Abstract: Disclosed herein is a method of removing the nitrogen oxides from the gases containing nitrogen oxides by contacting any such gas with ammonia at a temperature of from 100.degree. C. to 230.degree. C. in the presence of a catalyst so that a reaction takes place between the nitrogen oxides and ammonia. This reaction is conducted in such a manner as to prevent the by-produced ammonium nitrate from depositing on the catalyst. There is also disclosed a specific apparatus for practicing the method.
    Type: Grant
    Filed: December 30, 1977
    Date of Patent: April 22, 1980
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tadashi Araki, Hatsuo Seito, Masayuki Funabashi, Ritaro Saito, Koji Seguchi
  • Method for manufacture of catalyst used for reduction of nitrogen oxides and the catalyst produced by the method
    Patent number: 4149997
    Abstract: A catalyst having high activity at a low temperature is obtained by heating rhodochrosite in air at a temperature of 300.degree.-500.degree. C. A catalyst having still higher activity at a low temperature is obtained by mixing rhodochrosite with a specific amount of a specific metal compound and heating the resultant mixture in air at a temperature of 300.degree.-500.degree. C.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: April 17, 1979
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tadashi Araki, Hatsuo Saito, Masayuki Funabashi, Ritaro Saito, Koji Seguchi
  • Method for removing nitrogen oxides from nitrogen oxide-containing gases
    Patent number: 4146450
    Abstract: There is disclosed a method for removing nitrogen oxides from a nitrogen oxide-containing gas by contacting the gas with ammonia excited by ultraviolet irradiation in the presence of a catalyst to react the nitrogen oxides with the ammonia. According to the method, the reaction of nitrogen oxides with ammonia proceeds more rapidly than in the case of prior art methods.
    Type: Grant
    Filed: December 30, 1977
    Date of Patent: March 27, 1979
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tadashi Araki, Hatsuo Saito, Masayuki Funabashi, Ritaro Saito, Koji Seguchi
  • Dry method for the denitrification of exhaust gas containing nitrogen oxides
    Patent number: 4112053
    Abstract: From an exhaust gas containing nitrogen oxides, the nitrogen oxides can be advantageously removed by contacting the exhaust gas with ammonia in the presence of a substance derived from laterite.
    Type: Grant
    Filed: January 4, 1977
    Date of Patent: September 5, 1978
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hisao Sanada, Ritaro Saito, Masayuki Funabashi, Kazuyoshi Inada, Koji Seguchi