Patents by Inventor Jill A. Williams

Jill A. Williams 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: 4861808
    Abstract: A process for producing a radiopaque cement comprises reacting a polymer containing free carboxyl groups (generally a homo or copolymer of acrylic acid) with a particulate acid-leachable source of polyvalent metal ions (such as an acid-leachable glass) in the presence of water and strontium fluoride.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: August 29, 1989
    Assignee: Dentsply Limited
    Inventors: Richard W. Billington, Jill A. Williams
  • Patent number: 4814362
    Abstract: Alkaline earth metal aluminofluorosilicate glasses suitable for use as ion-sources in the poly(carboxylic acid) cement compositions contain strontium in order to provide radiopacity. The invention also provides methods for making poly(carboxylate) cement using the glasses of the invention as ion-sources.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: March 21, 1989
    Assignee: Dentsply Limited
    Inventors: Richard W. Billington, Jill A. Williams
  • Patent number: 4797431
    Abstract: A process for producing a radiopaque cement comprises reacting a polymer containing free carboxyl groups (generally a homo or copolymer of acrylic acid) with a particulate acid-leachable source of polyvalent metal ions (such as an acid-leachable glass) in the presence of water and strontium fluoride.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: January 10, 1989
    Assignee: Dentsply Limited
    Inventors: Richard W. Billington, Jill A. Williams
  • Patent number: D314721
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: February 19, 1991
    Inventors: Toxie P. Williams, Jr., Jill Williams
  • Patent number: D388723
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: January 6, 1998
    Inventors: Toxie P. Williams, Jr., Jill Williams