Patents by Inventor Daniel J. Coffman

Daniel J. Coffman 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).

  • GAS FLOW CONTROL BY DIFFERENTIAL PRESSURE MEASUREMENTS
    Publication number: 20080000530
    Abstract: A gas flow comparator comprises a gas control mounted on a gas tube to set a gas flow or pressure of a gas passing thorough the gas tube. A principal flow splitter comprises an inlet port connected to the gas tube. First and second flow restrictors are connected to the principal flow splitter. A pair of secondary flow splitters are each connected to a restrictor outlet of a flow restrictor. A differential pressure gauge is connected to the secondary flow splitters. A pair of nozzle holders are connected to the secondary flow splitters and are capable of being connected to first and second nozzles. In operation, the pressure differential gauge registers a pressure differential proportional to a variation in the passage of gas through the first and second nozzles.
    Type: Application
    Filed: May 25, 2007
    Publication date: January 3, 2008
    Inventors: DAVID P. SUN, Daniel J. Coffman, Sophia M. Velastegui, Steven E. Gianoulakis, Abhijit Desai