Patents by Inventor Gregory M. Fischer

Gregory M. Fischer 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).

  • Electronic landmark enhancement to GPS based navigation systems
    Patent number: 5748136
    Abstract: A system and apparatus for enhancing the satellite based navigation systems which includes providing an aircraft with an interrogating radar for interrogating beacons disposed at a predetermined location in front of a runway wherein the beacons are radar-activated passively powered runway beacons.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: May 5, 1998
    Assignee: Rockwell International Corporation
    Inventor: Gregory M. Fischer
  • Method and apparatus for current regulation in a gas discharge lamp
    Patent number: 5448136
    Abstract: A regulated and constrained current source is used to drive the cathodes of a hot cathode gas discharge lamp to provide heating during lamp operation. In one embodiment, the regulated current source is time shared between the lamp cathodes and the lamp arc.
    Type: Grant
    Filed: April 13, 1993
    Date of Patent: September 5, 1995
    Assignee: Rockwell International Corporation
    Inventor: Gregory M. Fischer
  • Dual filament lamp and drive apparatus for dimmable avionics displays
    Patent number: 5296783
    Abstract: An improved dimmable dual filament fluorescent lamp including a first filament and a second filament with automatic current switching between the first element and the second element when the first element opens due to a failure and further having a separating cold cathode getter plate disposed between the first filament and the second filament.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: March 22, 1994
    Assignee: Rockwell International Corporation
    Inventor: Gregory M. Fischer
  • Method and apparatus for driving a gas discharge lamp
    Patent number: 5250877
    Abstract: A regulated current source is used to drive the cathodes of a hot cathode gas discharge lamp. In one embodiment, the regulated current source is time shared between the lamp cathodes and the lamp arc.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: October 5, 1993
    Assignee: Rockwell International Corporation
    Inventor: Gregory M. Fischer