Patents by Inventor Andrew G Ritchie

Andrew G Ritchie 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).

  • Synthesis of lithium iron sulphides and their use as cathodes
    Patent number: 7018603
    Abstract: A process for the production of a lithium transition metal sulphide such as lithium iron sulphide, the process comprising reacting a transition metal sulphide with lithium sulphide in a solvent comprising a molten salt or a mixture of molten salts. Lithium transition metal sulphides obtained using this process are useful in the production of electrodes, in particular for rechargeable lithium batteries.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: March 28, 2006
    Assignee: Qinetiq Limited
    Inventors: Andrew G Ritchie, Peter G Bowles
  • Process for producing a lithium transition metal sulphide
    Patent number: 6740301
    Abstract: A process for the production of a lithium transition metal sulphide such as lithium iron sulphide, the process comprising reacting a transition metal sulphide with lithium sulphide in a solvent comprising molten sulphur. Lithium transition metal sulphides obtained using this process are also claimed and are useful in the production of electrodes, in particular for rechargeable lithium batteries.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: May 25, 2004
    Assignee: QinetiQ Limited
    Inventors: Andrew G Ritchie, Peter G Bowles
  • Synthesis of lithium transition metal sulphides
    Publication number: 20040018141
    Abstract: A process for the production of a lithium transition metal sulphide such as lithium iron sulphide, the process comprising reacting a transition metal sulphide with lithium sulphide in a solvent comprising a molten salt or a mixture of molten salts. Lithium transition metal sulphides obtained using this process are also claimed and are useful in the production of electrodes, in particular for rechargeable lithium batteries.
    Type: Application
    Filed: June 4, 2003
    Publication date: January 29, 2004
    Inventors: Andrew G. Ritchie, Peter G. Bowles