Patents by Inventor Daniel N. Karpen

Daniel N. Karpen 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).

  • Patent number: 5548491
    Abstract: A lamp, suitable for use as a headlight for land, water and aircraft and motor vehicles in particular. The lamp includes glass containing Neodymium Oxide, a rare earth compound. The Neodymium Oxide filters out the naturally occurring yellow light produced by a hot incandescent filament, thereby producing a color-corrected light. Yellow light contributes to a lack of contrast. Improvement in contrast permits, for example, a motor vehicle driver to better discriminate the contrast of objects when there is no daylight and the only illumination is artificial. For drivers, in particular, elimination of the excessive yellow light lessens eyestrain currently resulting from light emitted by the conventional headlights of oncoming vehicles during hours of darkness.
    Type: Grant
    Filed: January 4, 1995
    Date of Patent: August 20, 1996
    Inventor: Daniel N. Karpen
  • Patent number: 5359498
    Abstract: An improvement in a multi-layer polarized light control panel comprising an ultraviolet transmitting acrylic supporting structure. Prior art multi-layer polarized light control panels are made with an ultraviolet absorbing acrylic supporting sheet, which blocks most ultraviolet light below 380 nanometers. Thus, the ultraviolet light which is emitted by fluorescent lamps, and in particular by specially formulated fluorescent lamps to provide so called "full-spectrum" light, is blocked by the prior art polarized light control panels. Use of an ultraviolet transmitting acrylic supporting sheet would permit the transmission of the ultraviolet light emitted from the lamp through the acrylic supporting sheet, which would then be polarized by the multi-layer polarized light control panel. The light diffusing polarized control panel can also be manufactured with an ultraviolet transmitting acrylic, providing a multi-layer polarizer of unsurpassed visual comfort probability.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: October 25, 1994
    Inventor: Daniel N. Karpen
  • Patent number: 5184881
    Abstract: A full spectrum polarized lighting fixture for general commercial, institutional, and industrial use, and for use in offices with computer terminals and video display terminals. The lighting fixture contains an electronic solid state ballast, a polarizing lense, and a full spectrum color corrected lamp. The lense is a polarized diffuser to provide glare free light with excellent contrast. The fixture contains a full spectrum color corrected lamp to simulate daylight. The combination of the full spectrum lamp and the polarized diffuser provides for light with the spectral energy distribution characteristics and light polarization of natural daylight.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: February 9, 1993
    Inventor: Daniel N. Karpen