Patents by Inventor Koichi Ohtsu

Koichi Ohtsu 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).

  • Ultraviolet rays-absorbing composition and process for producing the same
    Patent number: 5976511
    Abstract: The invention provides an ultraviolet rays-absorbing composition having a pearly luster which comprises plate barium sulfate particles having a surface coated with at least one of zinc oxide, cerium oxide and titanium oxide and a process for preparing the same. The composition has a pearly luster of stable quality, satisfactory translucence, and a satisfactory feel.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: November 2, 1999
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Koichi Ohtsu, Noriaki Sato
  • Strontium borate pigment composition, method of making same, and processes of imparting anti-corrosive, anti-bacterial/anti-fungal and non-flammable properties to materials by using same
    Patent number: 5858079
    Abstract: The present invention provides a strontium borate pigment composition comprising particles of a strontium borate represented by the general formula (1):.alpha.SrO..beta.B.sub.2 O.sub.3..gamma.H.sub.2 O (1)(wherein O<.alpha..ltoreq.3, O<.beta..ltoreq.4, O.ltoreq..gamma..ltoreq.5), the particles being coated with at least one compound selected from the group consisting of compounds represented by the formulae (2) to (6):.delta.SrO..epsilon.SiO.sub.2..zeta.H.sub.2 O (2)(wherein O<.delta..ltoreq.3, O<.epsilon..ltoreq.2, O.ltoreq..zeta..ltoreq.4 ).eta.SrO..theta.Al.sub.2 O.sub.3..iota.H.sub.2 O (3)(wherein O<.eta..ltoreq.5, O<.theta..ltoreq.16, O.ltoreq..iota..ltoreq.6)SrSO.sub.4 (4)SrCO.sub.3 (5)andSrHPO.sub.4 (6),the pigment composition having an average particle diameter of 0.1 .mu.m to 5 .mu.
    Type: Grant
    Filed: March 25, 1997
    Date of Patent: January 12, 1999
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Koichi Ohtsu, Taizo Kaihatsu
  • Plate barium sulfate and process for producing the same
    Patent number: 5580377
    Abstract: A plate barium sulfate is described, which has a particle size of from 1 to 100 .mu.m or from 5 to 150 .mu.m, wherein neither a sulfide nor a soluble barium salt is detected by an analysis method based on the Japanese Cosmetics Material Standard. The process of the plate barium sulfate is also described.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 3, 1996
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Koichi Ohtsu, Hirobumi Yoshida, Noriaki Sato