Patents by Inventor John R. Clarkson

John R. Clarkson 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).

  • Oral hygiene composition
    Patent number: 5045305
    Abstract: An oral hygiene product especially for inhibiting caries is the form of toothpaste or mouthwash. The product maintains a low fluoride ion concentration in the mouth for longer periods than conventional products by the rapid precipitation of calcium fluoride either in the mouth or immediately prior to use. The product comprises a composition containing calcium ions and a further composition containing fluoride ions. The ion product of the calcium and fluoride ions of the combined product preferably exceeds 3.times.10.sup.-8 mol.sup.3 dm.sup.-9.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: September 3, 1991
    Assignee: Chesebrough-Pond's USA Co., division of Conopco, Inc.
    Inventors: John R. Clarkson, Ralph M. Duckworth, Andrew M. Murray, Timothy J. Price