Patents by Inventor Norihisa Yoshimori

Norihisa Yoshimori 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 manufacturing a coil heater of an indirectly-heated type cathode electrode of electronic tubes
    Patent number: 4149104
    Abstract: A coil heater of a heater-type tube comprises a main portion for generating heat and a pair of leg portions supporting the main portion. Lead wires are connected to the ends of the legs. At least a part of the leg portion, including its terminal part, comprises a triple-layer coil. The main portion comprising a single-layer coil and the leg portion except its terminal part covered with an insulating coating. The main portion and leg portions are formed by continuously winding a heater wire about a core alternately in opposite directions.
    Type: Grant
    Filed: December 15, 1977
    Date of Patent: April 10, 1979
    Assignee: Hitachi, Ltd.
    Inventor: Norihisa Yoshimori
  • Process for preventing the formation of nitrogen monoxide in treatment of metals with nitric acid or mixed acid
    Patent number: 3953263
    Abstract: The formation of nitrogen monoxide in treatment of metals with nitric acid or a mixed acid can be prevented by adding at least one of ammonium peroxodisulfate and hydrogen peroxide to nitric acid or a mixed acid consisting mainly of nitric acid and sulfuric acid.
    Type: Grant
    Filed: November 26, 1973
    Date of Patent: April 27, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Misao Ishikawa, Rokuro Tsuji, Norihisa Yoshimori