Patents by Inventor Helen M. Anstice

Helen M. Anstice 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).

  • Command-curable composition
    Patent number: 5601640
    Abstract: A light-curable dental cement composition contains (a) the reaction product of vinyl phosphonyl chloride and pentane 1,5 diol, (b) a photopolymerisation initiator, (c) ion-leachable aluminosilicate glass powder, (d) poly(vinyl phosphonic acid), (e) bisGMA as a photopolymerisable dimethacrylate resin, and water, inert filler and silanising agent. Upon mixing, glass is added last, the composition is put in place and, when ready, it is light-irradiated for 30 or 40 seconds to polymerise (e). The composition is immediately firm and the phosphonate groups adhere to tooth material while further slow curing by acid-base reaction continues.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: February 11, 1997
    Assignee: British Technology Group Limited
    Inventors: Helen M. Anstice, John W. Nicholson