Patents Assigned to Laura May Usher
  • Life-prolonging device for hearing-aid batteries
    Patent number: 4282474
    Abstract: A life-prolonging device for ear level hearing aid batteries and the like in which an electrical circuit mounted on a platform in a box-type housing sends an electric current from a larger battery through a hearing aid battery when an actuating switch lid is in the closed position.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: August 4, 1981
    Assignee: Laura May Usher
    Inventor: Andrew Wyzenbeek