Patents by Inventor Daniel Nathan Karpen

Daniel Nathan 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: 6933677
    Abstract: A magnetically shielded fluorescent lamp ballast case for shielding human beings from the negative effects of magnetic fields emanating from a fluorescent lamp ballast is made of a ferromagnetic alloy, or lined on the inside or the outside of the fluorescent lamp ballast case with such foil alloys. The ferromagnetic alloy for the magnetically shielded fluorescent lamp ballast case is a soft magnetic material. The soft magnetic material is a metal alloy containing one or more than one of the following elements: iron, nickel, or cobalt. The fluorescent lamp ballast case can be made of steel or aluminum, and lined on the inside or the outside of the ballast case with a ferromagnetic foil alloy which is attached to the steel or aluminum by adhesive. The magnetically shielded fluorescent lamp ballast case for a fluorescent lamp ballast can be employed for core coil fluorescent lamp ballasts or for electronic solid state fluorescent lamp ballasts.
    Type: Grant
    Filed: June 13, 1998
    Date of Patent: August 23, 2005
    Inventor: Daniel Nathan Karpen
  • Patent number: 6450652
    Abstract: Motor vehicle windshields and safety glazing material, suitable for use as motor vehicle windshields and safety glazing material for automobiles, trucks, buses, motorcycles, locomotives. sport utility vehicles, all terrain vehicles, and vans. The motor vehicle windshields and safety glazing material contains Neodymium Oxide, a rare earth compound. The Neodymium Oxide filters out the yellow portion of the spectrum, reducing glare. Incorporation of yellow light in the spectrum desaturates colors and reduces contrast. Improvement in contrast and a reduction in glare 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 yellow light lessens eye strain currently resulting from light emitted by the conventional headlights of oncoming vehicles during hours of darkness. Neodymium Oxide can also be added to safety glazing materials for use in bullet resistant shields.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: September 17, 2002
    Inventor: Daniel Nathan Karpen
  • Patent number: 6416867
    Abstract: A reduced glare window glass, suitable for use in glass window, containing Neodymium Oxide, a rare earth compound. The Neodymium Oxide filters out the yellow light of the spectrum, thereby providing improved vision. Incorporation of yellow light in the light spectrum desaturates colors and reduces contrast. Improvement in contrast and a reduction in glare permits, for example, one to use this window glass in a building to reduce glare without the expense of blinds or curtains that are normally used to reduce glare. Additionally, the light transmittance is kept high, as high as 61.81 percent with a Neodymium Oxide doping of the glass in the amount of at least 0.0244 grams per square centimeter. This glass can be used for multiple layers of glass in assembled glazing.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: July 9, 2002
    Inventor: Daniel Nathan Karpen
  • Patent number: 5961208
    Abstract: A high intensity discharge lamp, suitable for use as a headlight for land, rail, water, aircraft, and motor vehicles in particular. The lamp includes glass containing Neodymium Oxide, a rare earth compound. The Neodymium Oxide filters out the yellow light portion of the spectrum, thereby producing a color corrected light. Incorporation of yellow light in the light spectrum desaturates colors and reduces contrast. Improvement in contrast and a reduction in glare 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 yellow light lessens eye strain currently resulting from light emitted by the conventional headlights of oncoming vehicles during hours of darkness.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: October 5, 1999
    Inventor: Daniel Nathan Karpen
  • Patent number: 5844721
    Abstract: A rearview mirror suitable for use as a rearview mirror for land, water and aircraft and motor vehicles in particular. The glass mirror 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 vehicles in the rearview mirror during hours of darkness. Additionally, the Neodymium Oxide in the glass will filter out the yellow light from the rising or setting sun in the rearview mirror.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: December 1, 1998
    Inventor: Daniel Nathan Karpen