Patents by Inventor Roger R. Baum

Roger R. Baum 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 charger for portable rechargeable batteries
    Patent number: 5640079
    Abstract: The method of charging a portable rechargeable battery produces an electrical signal representing the battery output voltage. Rapid charging of the battery is initiated by supplying a high charging current to the battery when a signal representing the battery output voltage drops below a preselected lower threshold. The battery voltage at this lower threshold is high enough to maintain the operation of a device powered by the battery. The rapid charging of the battery is terminated after the signal representing the battery output voltage rises to a preselected upper threshold. The battery voltage at the upper threshold is substantially below the output voltage of a battery that is charged to 100% of its nominal capacity.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: June 17, 1997
    Assignee: Andrew Corporation
    Inventors: Robert N. Nelson, Roger R. Baum