Patents by Inventor Joyce Richardson

Joyce Richardson 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).

  • Flame retardant polymer composition containing phosphonic acid salts
    Patent number: 4972011
    Abstract: Compositions comprising a halogen-free polymer and, as flame retardant, at least one aluminum salt of a phosphonic acid of the formula: ##STR1## in which R is a straight or branched chain alkyl group having 1 to 3 carbon atoms optionally substituted by one or more of halogen atoms or hydroxyl groups and R' is hydrogen or an alkyl group having 1 to 3 carbon atoms.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: November 20, 1990
    Assignee: Ciba-Geigy Corporation
    Inventors: Joyce Richardson, Richard J. Dellar