Patents by Inventor Yi F. Yao

Yi F. Yao 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: 5466443
    Abstract: An herbal-based oral composition for promoting darkening of human hair color upon periodic retention of the composition within the oral cavity includes an herbal mixture included at a level of from 2.5 to 15% of the total weight of the herbal mixture in a toothpaste or chewing gum base. The herbal mixture includes prepared Rhizoma Ligustici Chuanxiong, Calculus Bovis, Indigo Naturalis, Herba Ecliptae, Radix Polygoni Multiflori, Pericarpium Trichosanthis, Radix Sophorae Flavescentis, Spina Gleditsiae, Radix Angelicae Sinensis, Rhizoma Drynariae, Fructus Mori, and Halitum. The composition is found effective at darkening hair color when held in the oral cavity for a short period of time two times a day for a period of six weeks.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: November 14, 1995
    Assignee: Shu K. Ho
    Inventors: Shu K. Ho, Yi F. Yao