Patents by Inventor Yo Hasegawa

Yo Hasegawa 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).

  • Resistor elements
    Patent number: 4350741
    Abstract: Resistor elements made by co-molding of film-resistors comprising conductive powder and polyimide resin and a diallyl isophthalate substrate containing more than 500 ppm inhibitors have good thermal stability and smooth surfaces, and are especially suitable for long life potentiometers for high temperature uses.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: September 21, 1982
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yo Hasegawa, Shigeru Yasuda, Kunio Kojima
  • Electrophotographic material containing sensitizers
    Patent number: RE28698
    Abstract: An electrophotographic material is provided herein which comprises a conductive support layer and a photoconductive insulating layer, the latter layer comprising a photoconductive polymeric compound such as poly-N-vinylcarbazole, and a sensitizer having the following general formula ##SPC1##WhereinB represents a radical selected from the group consisting of ##SPC2## ##SPC3##Compounds falling under the latter general formula include such compounds as 2-phenyl-4-[(2'-phenyl-4'-benzopyranylidene) benzyl]-benzopyrylium perchlorate and 2,3-phenyl-4-[(2'-phenyl 4'-benzopyranylidene)benzyl]-6-methylbenzopyrylium perchlorate.
    Type: Grant
    Filed: August 7, 1974
    Date of Patent: January 27, 1976
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshinobu Murakami, Yo Hasegawa, Kazuhisa Morimoto