Patents by Inventor Fred Benjamin

Fred Benjamin 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).

  • Method and circuit for determining battery capacity
    Patent number: 4413221
    Abstract: The capacity of a battery is determined while charging the battery by measuring the time it takes the battery voltage to decrease to a selected voltage level during discharging intervals interspersed between charging intervals. The state-of-charge is also determined by measuring the voltage level during a discharge interval while monitoring the duration of the charge cycle. Additionally, faulty cells of the battery are detected by measuring the voltage of the individual cells at the end of a discharging interval during the charging of the battery.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: November 1, 1983
    Assignee: Christie Electric Corporation
    Inventors: Fred Benjamin, Robert H. Heil