Patents by Inventor Tetu Yamamuro

Tetu Yamamuro 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).

  • Photo-sensitive and heat-sensitive composition and recording element using same
    Patent number: 4306014
    Abstract: A photo-sensitive and heat-sensitive composition consisting essentially of a leuco-pigment; a hydrogen donator; a photo-reductant which, when exposed to a visible light, produces a reducing agent by the action of said hydrogen donator coexisting therewith; a photooxidant which, when exposed to an ultraviolet ray, causes said leuco-pigment coexisting therewith to generate color and simultaneously, when reacted with said reducing agent, is deprived of its own oxidizing ability; and a cobalt complex which reacts with the reducing agent in amplifying manner to thereby suppress the reaction of a color-forming system, and a recording element using the same.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: December 15, 1981
    Assignee: Ricoh Co., Ltd.
    Inventors: Makoto Kunikane, Akiyoshi Yasumori, Kiyoshi Taniguchi, Tetu Yamamuro