Patents by Inventor David J. MacDonald

David J. MacDonald 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).

  • Golf club iron
    Patent number: 5989132
    Abstract: A golf club iron employs an elongated connection member to connect the lower end of a golf club shaft directly to the rear face of the golf club head over an elongated region between the top surface and the sole of the head. The connection region includes a line which is directly behind the center of mass of the head to enhance the transfer of energy to a golf ball where little or reduced torque is produced by off-center hits.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: November 23, 1999
    Inventors: David J. MacDonald, Vardy Taylor Pearson
  • Separation of zirconium and uranium
    Patent number: 4381287
    Abstract: Zirconium- and uranium-containing hydrocarbon-amine solutions are treated for separation of zirconium and uranium by means of a process comprising: (1) selective stripping of zirconium with an aqueous chloride solution, and (2) scrubbing the resulting aqueous solution with chloride-loaded hydrocarbon-amine solution to selectively remove uranium, thereby yielding an aqueous zirconium solution of low uranium content.
    Type: Grant
    Filed: March 30, 1982
    Date of Patent: April 26, 1983
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: David J. MacDonald, Helen G. Henry
  • Separation of zirconium from hafnium by solvent extraction
    Patent number: 4231994
    Abstract: Separation of zirconium and hafnium by solvent extraction with a tertiary amine from sulfuric acid solution is improved by addition of water-soluble .alpha.-hydroxycarboxylic acid to the aqueous phase.
    Type: Grant
    Filed: August 27, 1979
    Date of Patent: November 4, 1980
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventor: David J. MacDonald