Patents by Inventor Douglas W. DeWerth

Douglas W. DeWerth 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).

  • Common vent device for positive vent pressure and draft hood equipped gas appliances
    Patent number: 4768444
    Abstract: A vent device is provided for common venting of exhaust gases discharged from separate apparatus at different vent pressures. The vent device provides a passageway and exhaust gas inlets for combining the exhaust gases and conveying them to a single vent stack. The higher vent pressure exhaust gases are discharged within the passageway using a venturi or jet pump effect to provide a zone of reduced pressure in the passageway for inducing the flow of the lower vent pressure exhaust gases into the device.
    Type: Grant
    Filed: September 23, 1987
    Date of Patent: September 6, 1988
    Assignee: Gas Research Institute
    Inventors: Douglas W. DeWerth, James R. Deppisch, Sherwood G. Talbert, Ronald A. Cudnik
  • Flame insert
    Patent number: 4629415
    Abstract: A flame insert for reducing the NO.sub.x emissions of a range top burner is disclosed. The flame insert comprises a rigid framework provided by disjuncted support members connected to a pair of ring members. The support members engage the burner head to mount and accurately position the ring members adjacent the burner ports for engaging the flames during combustion and reducing the peak flame temperature by radiating heat energy away from the flames.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: December 16, 1986
    Assignee: Gas Research Institute
    Inventors: Douglas W. DeWerth, William G. Sterbik
  • Regulation of blue flame combustion emissions
    Patent number: 4525141
    Abstract: A flame insert for the reduction of emissions of oxides of nitrogen in atmospheric type burners is disclosed. The insert provides heat radiating surfaces which are contacted by the inner cones of the flames. The insert surfaces are sized and shaped to accommodate variations in flame position and to guide flames into contact therewith. A combined flame insert and secondary air baffling system is also disclosed.
    Type: Grant
    Filed: July 11, 1983
    Date of Patent: June 25, 1985
    Assignee: Gas Research Institute
    Inventors: Douglas W. DeWerth, Roger D. Sheridan