Patents by Inventor Takaji Watanabe

Takaji Watanabe 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).

  • Novel flaky color pigment and process for producing the same
    Patent number: 4956019
    Abstract: Flaky colored pigment comprising fine flaky powder as base material, and zinc oxide and an inorganic color pigment attached to the surface thereof.
    Type: Grant
    Filed: August 13, 1987
    Date of Patent: September 11, 1990
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Tamio Noguchi, Takaji Watanabe
  • Water resistant nacreous pigment and process for producing the same
    Patent number: 4828623
    Abstract: A process for the production of a water-resistant nacreous pigment, comprising hydrolyzing a zirconium or zirconyl compound, in the presence of a hypophosphite and in the presence of a metal oxide-coated mica flake pigment, whereby a hydrated zirconium oxide is deposited onto the surface of the metal oxide-coated mica flake, and a nacreous pigment comprising metal oxide-coated mica flakes coated with hydrated zirconium oxide.
    Type: Grant
    Filed: November 20, 1987
    Date of Patent: May 9, 1989
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Katsuhisa Nitta, Takaji Watanabe, Isao Suzuki
  • Flaky colored pigments, methods for their production, and their use in cosmetic compositions
    Patent number: 4772331
    Abstract: Colored flaky colored pigments are obtained by uniformly adhering a finely divided color pigment onto a flaky substrate by the use of an high molecular weight organic compound as a binder.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: September 20, 1988
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Tamio Noguchi, Takaji Watanabe
  • Molded clay article coated with pearl pigment
    Patent number: 4720438
    Abstract: A process for producing a molded clay article having pearly luster, comprised coating a molded clay article with a mixture of (1) a glaze adjusted to have the sum of the R.sub.2 O groups in the Seger formula in the range of 0 to 0.55 mole and (2) a pearlescent pigment comprising mica powder particles having a coating of transparent metal oxide; and firing the coated clay article at a temperature not exceeding 900.degree. C.
    Type: Grant
    Filed: June 13, 1986
    Date of Patent: January 19, 1988
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Takaji Watanabe, Katsuhisa Nitta
  • Flaky pigments, process for their preparation
    Patent number: 4603047
    Abstract: Flaky pigments, in which a flaky substrate, such as in particular mica, talc or kaolin, are provided with a firmly adhering coating of barium sulphate, if appropriate together with a metal oxide, hydrated metal oxide or metal carbonate, are advantageously used in cosmetics.
    Type: Grant
    Filed: October 22, 1984
    Date of Patent: July 29, 1986
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Takaji Watanabe, Tamio Noguchi
  • Transparent colored pigments
    Patent number: 4435220
    Abstract: Transparent, colored pigments based on platelet-shaped, transparent substrates, such as mica, talc or glass, are coated with colored metal oxides or metal hydroxides, wherein the metal oxide or hydroxide layer contains 0.1-5% by weight of an alkaline earth metal compound. These new, transparent, colored pigments are prepared by a process in which a platelet-shaped, transparent substrate, such as mica, talc or glass, is coated, in the presence of a base, with a colored metal oxide or hydroxide, and 0.1 to 5% by weight of an alkaline earth metal oxide or hydroxide is incorporated in the layer. The pigments have improved dispersibility, gloss, color power and stability to heat and weathering and also filling and adhesion properties. The pigments can be used for all the customary purposes, especially in cosmetics.
    Type: Grant
    Filed: October 26, 1982
    Date of Patent: March 6, 1984
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Takaji Watanabe, Tamio Noguchi