Patents by Inventor Frans Vollebregt

Frans Vollebregt 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).

  • Phosphor composition with a coating of colloidal SiO.sub.2 particles and an oxygen compound of magnesium, calcium, barium, zinc, or aluminum
    Patent number: 6013979
    Abstract: The invention relates to a display screen having a phosphor layer of a phosphor composition of a phosphor coated with an oxygen compound of one of the elements magnesium, calcium, barium, zinc and aluminium, and with colloidal SiO.sub.2 having an average particle size of 70 nm.ltoreq.d.ltoreq.130 nm. The invention further relates to a phosphor composition of a phosphor coated with an oxygen compound of one of the elements magnesium, calcium, barium, zinc and aluminium, and with colloidal SiO.sub.2 having an average particle size of 70.ltoreq.d.ltoreq.130 nm, and to a method of manufacturing the phosphor composition.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: January 11, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Friederike Picht, Michael Bredol, Joachim Opitz, Frans Vollebregt