Patents by Inventor C. Howard

C. Howard 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).

  • Respiratory exchange ratio sensor
    Publication number: 20060229526
    Abstract: A device for directly measuring a person's respiratory exchange ratio (RER) utilizes a Zn-air battery cell and a constant current load circuit as an O2 pump capable of drawing oxygen from expired air. A thermistor located in the flow path forms a leg of a bridge circuit whose output is proportional to oxygen concentration in the expired air and, therefore, to oxygen uptake. The thermistor flowmeter circuit utilizes the thermal conductivity differences between O2 and CO2 to provide a measure at the relative ratio of the two gases present.
    Type: Application
    Filed: March 31, 2005
    Publication date: October 12, 2006
    Applicant: Medical Graphics Corporation
    Inventors: Yu Chen, C. Howard, Michael Snow