Patents by Inventor Douglas Graeme Hann

Douglas Graeme Hann 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).

  • Methods of and furnaces for melting glass
    Patent number: 4000360
    Abstract: A furnace of the kind in which molten glass is heated by electrode means defining separate respective heating zones situated in horizontally spaced regions of the furnace chamber, glass being withdrawn along a withdrawal flow path extending between the heating zones to the outlet. Additional heating means is provided to heat the glass at a locality above the withdrawal flow path in the vicinity of the outlet, producing an upward convective pressure to counteract downward entrainment effects caused by flow of glass to the outlet.
    Type: Grant
    Filed: September 5, 1975
    Date of Patent: December 28, 1976
    Assignee: Elemelt Limited
    Inventors: Philip Anthony Maunsell Gell, Douglas Graeme Hann