1
Robert D Richardson, William L Erdman: Variable speed wind turbine. U S Windpower, Blakely Sokoloff Taylor & Zafman, January 21, 1992: US05083039 (215 worldwide citation)

A variable speed wind turbine is disclosed comprising a turbine rotor that drives an AC induction generator, a power converter that converts the generator output to fixed-frequency AC power, a generator controller, and an inverter controller. The generator controller uses field orientation to regula ...


2
Robert D Richardson, William L Erdman: Four quadrant motor controller minimizing distortion index. Kenetech Windpower, Blakely Sokoloff Taylor & Zafman, December 17, 1996: US05585708 (74 worldwide citation)

A motor control apparatus and method is disclosed for controlling a multiphase AC motor by controlling electrical quantities such as voltage or current applied to the stator of the motor. The apparatus includes a motor command unit for defining a reference signal indicative of a desired motor parame ...


3
Robert D Richardson, Thomas B Leanhart: Protective shield device for use with medicine vial and the like. Jon C Winger, November 12, 1985: US04552277 (53 worldwide citation)

A shield device particularly useful in conjunction with a medicine containing vial or ampule to prevent medicine from spraying out of the vial as a hypodermic needle is extracted from the vial seal. The shield device includes a enclosure having a collapsable wall structure. One end of the shield dev ...


4
Gerry Tucker, Robert D Richardson, Ian W Kaye, Joseph Norman Allen: Systems and methods for protecting a fuel cell. Ultracell Corporation, Beyer Weaver, July 17, 2008: US20080171239-A1

The invention relates to hybrid fuel cell systems that protect a fuel cell with a second electrical energy source. The second electrical energy source powers a load to prevent the fuel cell from witnessing stoichiometric levels that may lead to reductions in fuel cell performance or health. The hybr ...


5
Gerry Tucker, Robert D Richardson, Ian W Kaye, Joseph Norman Allen: Systems and methods for protecting a fuel cell. UltraCell Corporation, Beyer Weaver & Thomas, August 31, 2006: US20060194082-A1

The invention relates to hybrid fuel cell systems that protect a fuel cell with a second electrical energy source. The second electrical energy source powers a load to prevent the fuel cell from witnessing stoichiometric levels that may lead to reductions in fuel cell performance or health. The hybr ...