Patents by Inventor Yasuaki Oyama

Yasuaki Oyama 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).

  • Skin-whitening agent
    Patent number: 5262153
    Abstract: Lactic acid and its derivatives such as D-lactic acid, L-lactic acid, DL-lactic acid, and their nonmetallic derivatives and lactates of alkali metal or alkaline earth metal exhibit a strong skin-whitening effect at a concentration of 5 w/w % or higher in pigment cell. The skin-whitening effect is augmented by unsaturated fatty acids having a carbon number of 12-22.
    Type: Grant
    Filed: August 21, 1990
    Date of Patent: November 16, 1993
    Assignees: Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkujo, Sansho Seiyaku Kabushiki Kaisha, Yutaka Mishima
    Inventors: Yutaka Mishima, Yasuaki Oyama, Masashi Kurimoto
  • Process for preparing melanogenic inhibitor, and pigmentation-lightening agent containing the same
    Patent number: 5077059
    Abstract: The present invention relates to a process for preparing a melanogenic inhibitor and a pigmentation-lightening agent containing the same, more particularly, the present invention relates to a process for preparing a novel melanogenic inhibitor which is obtained by proliferating an established cell line from a warm-blooded animal, homogenizing the proliferated cells and recovering the same from the resultant homogenate, as well as to a pigmentation-lightening agent containing the same.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: December 31, 1991
    Assignees: Mishimazo Yuaka, Seibutsu Kagaku Kenkyujo, Sansho Seiyaku Kabushiki Kaisha, Sansho Seiyaku Kabushiki Kaisha
    Inventors: Yuyaka Mishima, Yasuaki Oyama, Masashi Kurimoto
  • Compositions for topical use having melanin synthesis-inhibiting activity
    Patent number: 4990330
    Abstract: Compositions for topical use having melanin synthesis-inhibiting activity comprising kojic acid or its esters and at least one compound selected from the group consisting of azelaic acid, tropolone, lipoic acid, sorbic acid, glucosamine, derivative of glucosamine, tunicamycin, deoxynojirimycin, glutathione, cystein, hydroquinone, derivative of hydroquinone, dehydroacetic acid, chelidonic acid and lipoamide. The compositions have excellent human skin-whitening effect and anti-suntan effect.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: February 5, 1991
    Assignee: Sansho Seiyaku Co., Ltd.
    Inventor: Yasuaki Oyama