Patents by Inventor Edward John Duff

Edward John Duff 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).

  • Process of preparing materials having calcium and phosphate components
    Patent number: 4108980
    Abstract: A process of supplying fluoride to teeth comprising applying to the teeth a source of fluoride ions and an orthophosphoric acid solution having a pH of about 3-4, then neutralizing the pH to about 7 with an aqueous neutralizing solution containing calcium ions and phosphate ions, wherein there is present about a stoichiometric amount of the phosphate ions relative to the calcium ions, the neutralizing solution having a pH of about 7.
    Type: Grant
    Filed: March 4, 1977
    Date of Patent: August 22, 1978
    Assignee: Colgate-Palmolive Company
    Inventor: Edward John Duff
  • Dental preparation containing materials having calcium and phosphate components
    Patent number: 4048300
    Abstract: Dental preparations containing materials having calcium and phosphate components are described. Such materials are typically fluorapatite, fluorohydroxyapatite, hydroxyapatite prepared by alternately changing the pH from about 7 to about 4 to about 7 several times, including such materials which have incorporated therein ions such as monofluorophosphate and carbonate or divalent ions such as zinc or fluoranions of a metal such as zinc, e.g. ZnF.sub.4.sup.-2.
    Type: Grant
    Filed: January 19, 1976
    Date of Patent: September 13, 1977
    Assignee: Colgate-Palmolive Company
    Inventors: Kenneth Tomlinson, Edward John Duff