Patents by Inventor Gerhard W. Doell

Gerhard W. Doell 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).

  • High luminance electrodeless projection lamp
    Patent number: 6016031
    Abstract: An Electrodeless High Intensity Discharge (EHID) lamp for projection applications. The lamp has a small (nominal dimensions: 2 mm I.D., 3 mm O.D., 6 mm internal length) capsule, which is constricted in a mid-portion thereof. The constriction squeezes the plasma within the capsule and provides a higher power density. This in turn produces a higher luminance in the center of the arc. This focal point of the projection system is constant over the life of the lamp, owing to the fact that the system is electrodeless. The arc tube or capsule is thickened in the vicinity of the constriction to permit heat transfer through the vitreous silica (commonly called quartz). The thickening carries the heat away from the now hotter mid-portion area. This thickening cools by virtue of increasing the thermal conduction through the glass.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: January 18, 2000
    Assignee: Osram Sylvania Inc.
    Inventors: Walter P. Lapatovich, Gerhard W. Doell, Robert K. Smith
  • High intensity electrodeless discharge lamp with particular metal halide fill
    Patent number: 5889368
    Abstract: An electrodeless high intensity discharge (EHID) lamp is disclosed for photo optical applications, such as videoprojection. The lamp contains a specific chemical fill that makes it useful as a light source for videoprojectors. The chemical fill completely vaporizes during operation, and comprises AlI.sub.3, InI, and an iodide of a metal selected from the group consisting of Th, Hf and Zr.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: March 30, 1999
    Assignee: Osram Sylvania Inc.
    Inventors: Gerhard W. Doell, Walter P. Lapatovich
  • Electrodeless high intensity discharge medical lamp
    Patent number: 5861706
    Abstract: A light source, particularly suited for surgical and other medical illumination applications, includes an electrodeless lamp assembly, a reflector having the electrodeless lamp assembly mounted therein and high frequency power source for supplying high frequency power to the electrodeless lamp assembly. The electrodeless lamp assembly includes an electrodeless high intensity discharge lamp capsule including a light transmissive discharge envelope enclosing a discharge volume containing a mixture of starting gas and chemical dopant material excitable by high frequency power to a state of luminous emission. The luminous emission has a color rendering index greater than 85 and preferably has a color rendering index greater than 90. The luminous emission preferably has low energy in the spectral range of 800 to 1000 nanometers relative to energy in the visible spectral range.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: January 19, 1999
    Assignee: Osram Sylvania Inc.
    Inventors: Walter P. Lapatovich, A. Bowman Budinger, Harold H. Goss, Gerhard W. Doell, Scott J. Butler, Fred Whitney