Patents by Inventor Graham Hazzard

Graham Hazzard 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).

  • Charge balancing of rechargeable batteries
    Patent number: 5028499
    Abstract: The invention relates to charge balancing of cells of rechargeable batteries. The battery comprises means to balance the distribution of hydrogen between all of the cells and means to remove the hydrogen from the cells. The battery further includes means to monitor the charge of each cell to detect if the charge of a cell becomes out of balance with the other cells. Hydrogen is added to the cells when the charges are out of balance to obtain self-discharge.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: July 2, 1991
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Leonard J. Pearce, Graham Hazzard
  • High temperature secondary cells
    Patent number: 4189529
    Abstract: A high temperature secondary cell of pelletized construction contained within a close fitting inert tube. Anode active material is lithium. Cathode active material is an iron sulphide or titanium disulphide. Electrolyte is a mixture of lithium halides. The cell is bounded by separator plates extending beyond the inner peripheral surface of the inert tube.
    Type: Grant
    Filed: March 22, 1978
    Date of Patent: February 19, 1980
    Assignee: National Research Development Corporation
    Inventors: Denis C. P. Birt, Colin R. Feltham, Graham Hazzard, Leonard J. Pearce