Patents by Inventor Kevin L. Beckstead

Kevin L. Beckstead 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).

  • Rechargeable vacuum with reduced AC voltage
    Patent number: 7345437
    Abstract: A motor is disclosed that operates on either AC outlet power or DC battery power with decreased power drop when switching between AC and DC power. The AC power to the motor may be stepped down by using a clipper circuit, while the DC power supplied to the motor may be increased by switching motor field windings from a series wound circuit to a parallel wound circuit. The motor may be used in a vacuum motor embodiment, or in other consumer devices that utilize electric motors.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: March 18, 2008
    Assignee: Shop Vac Corporation
    Inventors: Mark E. Baer, Kevin L. Beckstead