Patents by Inventor Christopher G. Tuppen

Christopher G. Tuppen 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).

  • Preparing substrates by annealing epitaxial layers in the form of nesas and substrates so prepared
    Patent number: 5279687
    Abstract: In order to grow single crystal, solid state devices onto a mismatched substrate, a secondary substrate is obtained by growing an epilayer divided into mesas (21) onto the primary substrate. The epilayer is annealed and this relieves the strain and causes dislocations to terminate preferentially on the sides of the mesas.
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: January 18, 1994
    Assignee: British Telecommunications PLC
    Inventors: Christopher G. Tuppen, Christopher J. Gibbings
  • Reagent source for molecular beam epitaxy
    Patent number: 5122393
    Abstract: A source assembly adapted to provide one or more metal organic compounds into an MBE reaction chamber wherein the source assembly comprises a mixer manifold which has one or more inlet connectors for providing the metal organic compounds. Each inlet connector includes a resistance valve for defining a flow rate of vapour of the metal organic compound under a pre-set pressure gradient and an on/off valve for selecting the operational status of the source. Preferably the mixer manifold acts as a collimator which avoids the need to fit a rotating substrate.
    Type: Grant
    Filed: April 7, 1988
    Date of Patent: June 16, 1992
    Assignee: British Telecommunications public limited company
    Inventors: Christopher G. Tuppen, David A. Andrews