Patents by Inventor Willard P. Francis

Willard P. Francis 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: 5747909
    Abstract: A hybrid alternator comprising a stator, and a rotor mounted for rotation within the stator and separated therefrom by an air gap. The rotor has a rotor core defining a plurality of magnetic poles wherein adjacent ones of the magnetic poles have alternating north and south magnetic fields. The plurality of magnetic poles comprises a plurality of permanent magnet poles and a plurality of electromagnetic poles. Each permanent magnet pole is defined by a permanent magnet. The plurality of permanent magnet poles comprises two (2) sets of diametrically positioned permanent magnet poles. Each permanent magnet is positioned within the rotor perimeter and associated with a pair of adjacent magnetic poles to form adjacent permanent magnet poles. The hybrid alternator also includes a temperature monitoring voltage regulator that provides protection against overheating damage while permitting the alternator to significantly exceed its rated output for short periods of time or in colder ambient temperatures.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: May 5, 1998
    Assignee: Ecoair Corp.
    Inventors: Charles D. Syverson, Willard P. Francis
  • Patent number: 4357988
    Abstract: A dual capacity air-conditioning/heating system including an evaporator, a blower, a compressor and compressor motor, the compressor motor having a two-speed mode of operation. The compressor motor speeds are changed by changing the shunt field current of the motor to achieve a significant reduction of energy consumption in the low-speed mode of operation. The blower motor has a two-speed mode of operation by changing the series armature resistance thereof.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: November 9, 1982
    Assignee: Safety Electrical Equipment Corp.
    Inventors: David J. Hudson, Willard P. Francis