Patents by Inventor Kunihiko Aida

Kunihiko Aida 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).

  • Process for preparation of paper-making hydrous silicic acid filler
    Patent number: 4790486
    Abstract: An improved paper-making hydrous acid filler is prepared by classifying or pulverizing a slurry containing fine particles of hydrous silicic acid, which is obtained by neutralizing sodium silicate with sulfuric acid, by a wet classifier or a wet pulverizer, so that the proportion of particles having a particles size of 1 to 30 .mu.m is at least 80% and the proportion of particles having a particle size of at least 70 .mu.m is not more than 0.4%. The filler has a function of improving the ink receptivity of the paper of the internal additive type and is capable of improving the opacity of the paper after printing.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: December 13, 1988
    Assignee: Oji Paper Company, Ltd.
    Inventors: Shigeru Eimaeda, Kunihiko Aida, Shinji Seto, Takao Suzuki