Patents by Inventor Fred A. Plofchan

Fred A. Plofchan 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).

  • Light tube with slidable electrodes
    Patent number: 4897572
    Abstract: A wide angle flash tube reflector has dual involute surfaces thereon intersecting at a cusp and bent in the horizontal to intercept light from a light source adjacent the cusp and to reflect such light in a dispersion pattern that spreads the flash coverage to match extended light coverages of lenses from a normal focal length to extreme wide angle. One light source is in the form of a bent tube having adjustably positioned cathode and anode electrodes for varying the length of a plasma arc to control the extent of the dispersion pattern reflected from the dual involute surfaces.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: January 30, 1990
    Inventor: Fred A. Plofchan
  • Reflector with curved dual involute surfaces
    Patent number: 4843521
    Abstract: A wide angle flash tube reflector has dual involute surfaces thereon intersecting at a cusp and bent in the horizontal to intercept light from a light source adjacent the cusp and to reflect such light in a dispersion pattern that spreads the flash coverage to match extended light coverages of lenses from a normal focal length to extreme wide angle. One light source is in the form of a bent tube having adjustable positioned cathode and anode electrodes for varying the length of a plasma arc to control the extent of the dispersion pattern reflected from the dual involute surfaces.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: June 27, 1989
    Inventor: Fred A. Plofchan