Patents by Inventor Stuart James Penn

Stuart James Penn 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).

  • Temperature stabilization of dielectric resonator
    Patent number: 6803132
    Abstract: A dielectric resonator having a first layer of alumina and a second layer of TiO2 is disclosed which has a superior combination of properties such as low dielectric loss, low temperature coefficient and high thermal conductivity.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: October 12, 2004
    Assignee: South Bank University Enterprises Ltd.
    Inventors: Neil McNeil Alford, Stuart James Penn, Jonathan Breeze
  • Modified sintered materials
    Patent number: 6610623
    Abstract: Low dielectric loss ceramic materials useful in dielectric resonators comprise alumina doped with a minor amount, preferably below 2% by weight of a metal or semi metal oxide, preferably an oxide of titanium, niobium, yttrium or zirconium. The compositions can be made by sintering the powders together below their melting point and materials with a with a Q value of greater than 35,000 at 9-10 GHz and at 25° C., can be obtained.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: August 26, 2003
    Inventors: Neil McNeill Alford, Stuart James Penn
  • Sintered Materials
    Publication number: 20030013597
    Abstract: Sintered aluminas of Q value of greater than 25,000 and up to and greater than 45,000 at 10 GHz and at 25° C., useful in useful in dielectric resonators can be obtained by sintering alumina powders with low level of impurities at between 1500° C. and 1600° C. until a density of at least 98% of its theoretical value is obtained.
    Type: Application
    Filed: August 12, 2002
    Publication date: January 16, 2003
    Inventors: Neil McNeil Alford, Stuart James Penn