Patents by Inventor Katsumasa Iwaya

Katsumasa Iwaya 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).

  • Patent number: 5032390
    Abstract: A novel anti-suntan cosmetic composition comprises from 1 to 25% by weight of fine particulate zinc oxide having an average particle size of from 70 to 300 m.mu., which scatters or absorbs ultraviolet rays, especially those in UV-A region.The composition prevent human skin from blotches and freckles, and supress the aging of the skin.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: July 16, 1991
    Assignee: Kao Corporation
    Inventors: Katsumasa Iwaya, Hajime Hotta
  • Patent number: 4857308
    Abstract: A cosmetic comprises an alkyl phosphate represented by the formula (I): ##STR1## in which R.sub.1 and R.sub.2 independently represent hydrogen atom or an alkyl group having from 1 to 36 carbon atoms, and R.sub.3 represents an alkyl group having from 1 to 36 carbon atoms, and a cosmetic powder.The cosmetic is water-repellent in nature, unlikely to break by sweat and is readily spread on the skin with improved softness due to incorporation of the alkyl phosphate.The cosmetic is prepared by first mixing the cosmetic powder and the alkyl phosphate dissolved in an organic solvent under heating conditions. Subsequently, the solvent is distilled off to form an alkyl phosphate coating on the indivisual particles. The coated particles are mixed with other cosmetic ingredients.
    Type: Grant
    Filed: August 21, 1986
    Date of Patent: August 15, 1989
    Assignee: Kao Corporation
    Inventors: Junichi Fukasawa, Haruya Kato, Katsumasa Iwaya, Takako Shimizu, Atsushi Kawano