Patents by Inventor Toru Katsura

Toru Katsura 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 producing alkaline paper
    Patent number: 5362364
    Abstract: An alkaline paper is produced by adding a cationic starch containing an alkyltetrahydro-1,3,5-2H-thiadiazine-2-thione or a bromonitroalcohol, and an alkylketene dimer to a paper stock. Formation of slime in the paper stock system is substantially inhibited and an alkaline paper excellent in sizing characteristics and safety to man is obtained.
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: November 8, 1994
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Toru Katsura, Hideaki Senoh
  • Photograhic paper support
    Patent number: 5082724
    Abstract: A photographic support consisting essentially of base paper and a polyolefin resin with which both sides of the base paper are coated, the base paper having a standard deviation of the weight variation caused by a wire mark formed on the base paper of 1.0 g/m.sup.2 or less and a standard deviation of the weight variation caused by the dispersibility of pulp fiber composing the base paper of 8.0 g/m.sup.2 or less. The photographic support has an excellent smoothness.
    Type: Grant
    Filed: February 6, 1990
    Date of Patent: January 21, 1992
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Toru Katsura, Hiroo Kaji
  • Heat sensitive recording paper
    Patent number: 5024986
    Abstract: Heat sensitive recording paper having such a thickness distribution that the average amplitude of paper thickness variation, between 0.2-mm and 1.0-mm wavelengths of paper thickness variation, does not exceed 0.5 .mu.m and no distinctive variation peak is present in the above wavelength range.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: June 18, 1991
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Toru Katsura, Hiroo Kaji, Kenji Hyodo, Hirokazu Ohkura
  • Polyolefin coated photographic paper support
    Patent number: 4665014
    Abstract: A photographic paper support comprising a base paper coated on both sides with a polyolefin resin is markedly improved in resistance to the stain occurring around the edges after development processing (edge stain), by the inclusion of an anionic polyacrylamide and a cationic starch in said base paper.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: May 12, 1987
    Assignee: Mitsubishi Paper Mills, Inc.
    Inventor: Toru Katsura
  • Photographic paper containing magnesium oxide
    Patent number: 4482628
    Abstract: A photographic paper comprising a web and a photographic emulsion coated on the web wherein the web contains at least one member selected from the group consisting of weak acid salts of magnesium, calcium and zinc and oxides of magnesium, calcium and zinc as a photographic-properties improving agent in an amount of 0.01% by weight or more based on the weight of the pulp in the web is remarkably effective on reducing unfavorable influence on photographic properties caused by chemical additives in the web. Such an effect is particularly remarkable when the web contains at least one cationic additive such as cationic sizing agent, cationic strength agent, etc.
    Type: Grant
    Filed: September 12, 1980
    Date of Patent: November 13, 1984
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Toru Katsura, Massashi Kubbota