Patents by Inventor Ippei Shimizu

Ippei Shimizu 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).

  • Color-developing sheet for pressure-sensitive recording sheet
    Patent number: 4416471
    Abstract: A color developing sheet for pressure-sensitive recording sheet containing in its color-developing layer an organic coreactant (color-developing agent), calcium carbonate and acrylamide-modified polyvinylalcohol with this construction the color developing sheet provides very much improved mark formation and improved printability such as high surface strength, rapid ink setting, etc..
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: November 22, 1983
    Assignee: Jujo Paper Co., Ltd.
    Inventors: Noboru Yamato, Akira Hasegawa, Ippei Shimizu