Patents by Inventor Michael P. Duffey

Michael P. Duffey 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).

  • Magnesium vapor discharge lamp
    Patent number: 5757133
    Abstract: An arc lamp having a sealed lamp tube with electrodes to either side of a septum. The septum extends through the length of the arc chamber. An emissions chamber extends from the end of the arc chamber without the septum. A window at the end of the emissions chamber is displaced from the end of the septum and from the arc chamber itself by a sufficient distance so that magnesium diffusing from the electrodes does not darken the surface. The magnesium electrodes are slugs encased within high temperature cells open at one end.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: May 26, 1998
    Assignee: UVP, Inc.
    Inventors: Ronald A. Meyer, Michael P. Duffey, Robert A. Foss
  • Method for the manufacture of bent tube lamps
    Patent number: 5690531
    Abstract: A lamp including an elongate tube with a septum extending longitudinally therethrough to near the distal end of the tube. A pair of assembled leads and electrodes are positioned in the tube through the terminal end and the tube sealed. With an end cap on the distal end of the tube, an elongate cavity is formed extending along either side of the septum and joined at the distal end. A bend is made in the tube such that the ends of the electrodes extend into areas within the elongate cavity between the bend and the distal end of the tube.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: November 25, 1997
    Assignee: UVP, Inc.
    Inventors: Robert A. Foss, Patrick M. Lewis, Michael P. Duffey
  • Bent tube lamp
    Patent number: 5600205
    Abstract: A lamp including an elongate tube with a septum extending longitudinally therethrough to near the distal end of the tube. A pair of assembled leads and electrodes are positioned in the tube through the terminal end and the tube sealed. With an end cap on the distal end of the tube, an elongate cavity is formed extending along either side of the septum and joined at the distal end. A bend is made in the tube such that the ends of the electrodes extend into areas within the elongate cavity between the bend and the distal end of the tube.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: February 4, 1997
    Assignee: UVP, Inc.
    Inventors: Robert A. Foss, Patrick M. Lewis, Michael P. Duffey