Patents by Inventor W. David Stratton

W. David Stratton 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).

  • Patent number: 5387858
    Abstract: An energy-conserving photvoltaic- or solar-rechargeable power source for commercial or industrial battery-operated products is provided, enabling a high degree of reliability of continued operation through a method involving the use of a backup battery or other backup d.c. voltage source which is automatically and instantaneously selected when the rechargeable cell falls below a predetermined lower threshold voltage. As the rechargeable cell receives charge from the solar cell, the circuit automatically switches back to it as the primary power source when an upper threshold voltage is reached. Moreover, the initial connecting of the rechargeable cell to power the product is ensured upon the turn-on of the product, even if not fully charged (though above the lower threshold voltage), conserving the backup source. More general applications are also disclosed.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: February 7, 1995
    Assignee: Academy of Applied Science
    Inventors: Edward D. Bender, W. David Stratton