Patents by Inventor Joyce Grainger

Joyce Grainger 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).

  • Bleaching systems comprising percarbonate, persulfate, and pyrogenic silica
    Patent number: 4247537
    Abstract: The invention relates to a bleaching powder which comprises at least 25% by weight of ammonium persulphate, at least 25% by weight of sodium percarbonate or potassium percarbonate and pyrogenic silica in percentages whereby the same can in a vaporproof enclosure be marketed in a premixed dry form which is capable upon aqueous activation of bleaching hair or keratinuous fiber. The one component bleach preferably includes pyrogenic silica in the range of from 4 to 10% by weight and preferably the percentage of the persulphate and percarbonate compounds is in the range of 35% by weight each upwards. Ideally the mixture also includes sequestering and wetting agents. In other forms the invention consists in methods of bleaching and methods of preparation of the bleaching powder.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: January 27, 1981
    Inventors: Peter F. R. Lunn, Joyce Grainger