Patents by Inventor Douglas A. Doughty

Douglas A. Doughty 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).

  • Apparatus for securing an amalgam at the apex of an electrodeless fluorescent lamp
    Patent number: 5500567
    Abstract: A glass rod extending through and sealed to the exhaust tube of an electrodeless SEF fluorescent discharge lamp has a metal support member at one end thereof for supporting an amalgam at or near the apex of the lamp envelope. The metal support member may comprise a spiral-shaped wire, a wire screen, or a wire basket. Preferably, the amalgam is maintained in contact with the apex of the lamp envelope. If desired, the metal support member may comprise a magnetic material to allow for magnetic transport of the amalgam assembly during lamp processing. The metal support member restricts spreading of the amalgam when in a liquid state; and the glass rod provides rigid support for the amalgam independent of lamp orientation.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: March 19, 1996
    Assignee: General Electric Company
    Inventors: Ronald H. Wilson, Douglas A. Doughty, John P. Cocoma
  • Use of silicon to extend useful life of metal halide discharge lamps
    Patent number: 5136214
    Abstract: A silicon flake comprising silicon in a sufficient quantity is inserted into the arc tube of a high-intensity, metal halide discharge lamp in order to avoid a substantial buildup of free halogen, thereby extending the useful life of the lamp.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: August 4, 1992
    Assignee: General Electric Company
    Inventors: Victor D. Roberts, Douglas A. Doughty, Jennifer L. Myers