Patents by Inventor Richard Charles Tozer

Richard Charles Tozer 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: 6274986
    Abstract: An apparatus and method for applying short pulsed waveforms, on the order of 1 &mgr;s pulses at a frequency of about 5 kHz, to a discharge lamp, such as a low-pressure mercury/argon lamp, in order to shift the ratio of the intensities of two of the mercury lines, in particular the 254 nm and 365 nm lines, of which for a sinusoidal excitation signal the 254 nm line is predominant, towards the higher wavelength. This greatly increases the efficiency of a lamp using phosphors excited by these UV emissions, because of the reduced Stokes shift.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: August 14, 2001
    Assignee: University of Sheffield
    Inventors: Robin Devonshire, Timothy James Healey, David Andrew Stone, Richard Charles Tozer
  • Patent number: 5797114
    Abstract: A method and apparatus for resistivity mapping of semiconductor materials by causing currents to flow in a semiconductor body and measuring resultant potentials created between pairs of surface probes. A resistivity map is produced using the information gathered.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: August 18, 1998
    Assignees: The University of Sheffield, Bio-Rad Microscience Limited
    Inventors: John Roberts, Ian Leslie Freeston, Richard Charles Tozer, Anthony Charles Gorvin, Ian Christopher Mayes, Francois Jean Djamdjl, Stephen Richard Blight