Patents by Inventor Derek P. A. Pearson

Derek P. A. Pearson 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).

  • Platinum and cobalt multilayer recording materials system and process for making same
    Patent number: 6022630
    Abstract: A materials system in which exchange coupling is achievable has the potential for allowing direct overwriting of data and comprises at least two multilayer films of platinum and cobalt with independently controlled coercivity and Curie temperatures.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: February 8, 2000
    Assignee: Johnson Matthey Electronics, Inc.
    Inventors: Joseph Miller, Derek P A Pearson, Philip G. Pitcher
  • Multilayer film materials system
    Patent number: 5851363
    Abstract: Pt/Co multilayer materials systems having a thin metal interlayer possess superior room temperature coercivity, a square polar Kerr hysteresis loop, sufficient polar Kerr rotation, and are suitable for magneto-optical recording.These material systems allow the reading and writing of information from the substrate side of the multilayer film.
    Type: Grant
    Filed: August 26, 1994
    Date of Patent: December 22, 1998
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Joseph Miller, Derek P A Pearson, Philip G Pitcher
  • Multilayer film materials system
    Patent number: 5837386
    Abstract: Pt/Co multilayer systems having a thin metal interlayer possess superior room temperature coercivity, a square polar Kerr hysteresis loop, sufficient polar Kerr rotation, and are suitable for magneto-optical recording. These materials systems allow the reading and writing of information from the substrate side of the multilayer film.
    Type: Grant
    Filed: January 14, 1997
    Date of Patent: November 17, 1998
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Joseph Miller, Derek P. A. Pearson, Philip G. Pitcher
  • Magneto-optical recording materials system
    Patent number: 5702830
    Abstract: A materials system in which exchange coupling is achievable has the potential for allowing direct overwriting of data and comprises at least two multilayer films of platinum and cobalt with independently controlled coercivity and Curie temperatures.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: December 30, 1997
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Joseph Miller, Derek P. A. Pearson, Philip G. Pitcher
  • Cast component of nickel alloys containing large amounts of chromium
    Patent number: 4662920
    Abstract: Nickel alloys comprising less than 25% by volume of .gamma.' precipitate and containing 23 to 37% by weight of chromium and in addition a trace to 1.7% carbon, 0.3 to 4% by weight of platinum and/or 0.3 to 8% by weight of ruthenium, a trace to 1.5% by weight titanium and/or a trace to 1.5% aluminium the balance being nickel. The alloys combine improved corrosion resistance with high mechanical strength. Major improvements in mechanical strength seem to be obtained by adding small amounts of titanium and/or aluminium. The alloy is especially suited for use in contact with molten glass for example in a centrifugal spinner.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: May 5, 1987
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Duncan R. Coupland, Derek P. A. Pearson