Patents by Inventor Jeffrey Evers

Jeffrey Evers 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).

  • Battery cell by-pass circuit
    Patent number: 6271646
    Abstract: The invention is a circuit and method of limiting the charging current voltage from a power supply net work applied to an individual cell of a plurality of cells making up a battery being charged in series. It is particularly designed for use with batteries that can be damaged by overcharging, such as Lithium-ion type batteries. In detail, the method includes the following steps: 1) sensing the actual voltage level of the individual cell; 2) comparing the actual voltage level of the individual cell with a reference value and providing an error signal representative thereof; and 3) by-passing the charging current around individual cell necessary to keep the individual cell voltage level generally equal to a specific voltage level while continuing to charge the remaining cells.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: August 7, 2001
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Jeffrey Evers, Ronald V. Gelger
  • Battery cell by-pass circuit
    Patent number: 6211650
    Abstract: The invention is a circuit and method of limiting the charging voltage applied to an individual cell of a plurality of cells making up a battery being charged in series. It is particularly designed for use with batteries that can be damaged by overcharging, such as Lithium-ion type batteries. In detail, the method includes the following steps: sensing the actual voltage level of the individual cell; comparing the actual voltage level of the individual cell with a specific voltage level and providing an error signal representative thereof; and by-passing the charging current around the individual cell necessary to keep the individual cell voltage level generally equal to the specific voltage level while continuing to charge the remaining cells.
    Type: Grant
    Filed: January 12, 2000
    Date of Patent: April 3, 2001
    Assignee: Lockheed Martin Corporation
    Inventors: Susan J. Mumaw, Jeffrey Evers, Calvin L. Craig, Jr., Stuart D. Walker