Patents by Inventor Humika Satou

Humika Satou 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).

  • Alcoholic marking pen ink composition
    Patent number: 5279653
    Abstract: When something is written on the nonabsorbent surface of an iron plate, a glass plate or the like with a conventional marking pen ink using ethanol, the fixing power of the handwriting is weak, whitening phenomenon occurs owing to hygroscopicity, and ink scratch takes place as a result of the clogging of a penpoint. The present invention provides an alcoholic marking pen ink composition not having such drawbacks.The ink composition of the present invention is characterized by comprising a colorant, ethanol, an ethanol-soluble phenolic resin having a softening point of 60.degree. to 100.degree. C. or its derivative, and an ethanol-soluble ketone resin having a softening point of 60.degree. to 100.degree. C.
    Type: Grant
    Filed: July 9, 1992
    Date of Patent: January 18, 1994
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Kiyohiko Kobayashi, Humika Satou