Patents by Inventor Leslie J. George

Leslie J. George 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).

  • Fluorescent lamp discharge tube having electrostatically coated envelope
    Patent number: 4914723
    Abstract: A fluorescent lamp discharge tube has an electrostatically coated envelope. The coating comprises a mixture of 100 parts by weight of phosphor, 0.01 to 3 parts by weight of a fatty acid having a melting point greater than 40.degree. C. or the ammonium, aluminum alkaline earth salts thereof, and 0.05 to 5 parts by weight of finely divided aluminum oxide having a grain size smaller than 0.1 micron. The phosphor is applied to the tube by a venturi effect and results in a more uniformly applied coating than is provided using a suspension coating. Uniformity of the coating is measured by the disclosed optical densitometry test.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: April 3, 1990
    Assignee: Thorn EMI plc
    Inventors: Roger P. Ellerbeck, Leslie J. George, Peter W. Ranby, Peter J. Clewer