1
Robert Stephen Potratz, Michael W Nootbaar: Pulse oximeter with sigma-delta converter. Nellcor Puritan Bennett, Hovey Williams Timmons & Collins, July 13, 1999: US05921921 (170 worldwide citation)

A preferred oximeter detects the transillumination by red and infrared light of a portion of an in vivo subject and produces analog signals representative thereof on two channels. Sigma-delta modulators sample the analog signals on each channel. A digital filter processor digitally filters the sampl ...


2
Robert Stephen Potratz: Lamp modulation circuit having a feedback for measuring lamp temperature. Nellcor Puritan Bennett, Hovey Williams Timmons & Collins, January 12, 1999: US05859503 (4 worldwide citation)

A lamp drive circuit periodically energizes a lamp above its rated voltage and current for rapid illumination of the lamp. In the preferred embodiment, the lamp is connected in a voltage divider and the circuit monitors the voltage drop across the lamp. The voltage drop is indicative of the lamp res ...


3
Robert Stephen Potratz: Lightweight inflation device. David M Pankros Attorney at Law, April 26, 2016: US09322406

A lightweight inflation device for outputting a low-pressure airflow to inflate an air bladder includes a body defining an airflow chamber and a plurality of air manipulation elements disposed within the airflow chamber. At least one of the air manipulation elements is a rotor including a plurality ...


4
Robert Stephen Potratz: Lightweight inflation device. June 2, 2011: US20110129369-A1

A lightweight inflation device for outputting a low-pressure airflow to inflate an air bladder includes a body defining an airflow chamber and a plurality of air manipulation elements disposed within the airflow chamber. At least one of the air manipulation elements is a rotor including a plurality ...



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