Patents by Inventor David R. Palowkar

David R. Palowkar 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).

  • Luminescent materials
    Patent number: 4446048
    Abstract: A phosphor for use in fluorescent lamps which comprises calcium sulphate and, optionally, up to 50% of strontium sulphate together with cerium (0.5-10%), manganese (up to 10%), an alkali metal (0.001 to 3%) and boron and/or aluminium (0.001 to 8%). The phosphor may be produced by blending and then firing the individual components. Tubes for use in the lamps may be electrostatically coated with the phosphor.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: May 1, 1984
    Assignee: Thorn Emi Limited
    Inventors: Peter W. Ranby, David R. Palowkar