Patents by Inventor Charles Francis Burns

Charles Francis Burns 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).

  • Tabletting spherical dental amalgam alloy
    Patent number: 3933961
    Abstract: A process is provided for tabletting spherical dental amalgam alloy. The process comprises treating the particles of spherical alloy by contacting them with a hydrochloric acid solution of cupric chloride, separating the acidic cupric chloride solution from the spherical alloy particles, washing the spherical alloy particles with water, drying the spherical alloy particles to remove residual water and then compacting the treated spherical alloy particles into a solid form such as a tablet.
    Type: Grant
    Filed: December 13, 1974
    Date of Patent: January 20, 1976
    Assignee: Pennwalt Corporation
    Inventor: Charles Francis Burns
  • Tabletting spherical dental amalgam alloy
    Patent number: RE29093
    Abstract: A process is provided for tabletting spherical dental amalgam alloy. The process comprises treating the particles of spherical alloy by contacting them with a hydrochloric acid solution of cupric chloride, separating the acidic cupric chloride solution from the spherical alloy particles, washing the spherical alloy particles with water, drying the spherical alloy particles to remove residual water and then compacting the treated spherical alloy particles into a solid form such as a tablet.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: December 28, 1976
    Assignee: Pennwalt Corporation
    Inventor: Charles Francis Burns