Patents by Inventor Ted J. Wiegandt

Ted J. Wiegandt 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).

  • Method of dispensing fuel into transient flow of an exhaust system
    Patent number: 7337607
    Abstract: A system or method for controlling the delivery of fuel into the transient flow of an exhaust system to control emissions. A mathematical model representative of the exhaust system can be used to determine, based on operating conditions of the exhaust system, a rate of fuel delivery suitable for achieving a desired result. The desired result can be to increase the temperature of a diesel particulate filter to a temperature suitable for regeneration without exceeding a temperature that may damage the diesel particulate filter.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: March 4, 2008
    Assignee: Donaldson Company, Inc.
    Inventors: Zhixin Jason Hou, Wayne M. Wagner, Wenzhong Zhang, Edward A. Steinbrueck, Theodore G. Angelo, Ted J. Wiegandt, Mike Anderson
  • Mufflers for use with engine retarders; and methods
    Patent number: 6354398
    Abstract: A muffler is described for muffling both positive power and compression brake type engine retarders. The muffler includes an outer shell defining an internal volume. A first, inner, perforated wall is spaced from the outer shell and defines a first, annular, volume therebetween. A first volume of packing material is positioned within the annular volume. An inlet tube is oriented within the internal volume. In certain embodiments, the inner perforated wall circumscribes at least a portion of the inlet tube, and extends a distance of at least 25% of the axial length of the outer wall. Both single and dual muffler systems are described. Methods of use and operation are also provided.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: March 12, 2002
    Assignee: Donaldson Company, Inc.
    Inventors: Theodore G. Angelo, John Hamrin, Eivind Stenersen, John Hiemstra, Wayne M. Wagner, Ted J. Wiegandt
  • Mufflers for use with engine retarders; and methods
    Patent number: 6082487
    Abstract: A muffler is described for muffling both positive power and compression brake type engine retarders. The muffler includes an outer shell defining an internal volume. A first, inner, perforated wall is spaced from the outer shell and defines a first, annular, volume therebetween. A first volume of packing material is positioned within the annular volume. An inlet tube is oriented within the internal volume. In certain embodiments, the inner perforated wall circumscribes at least a portion of the inlet tube, and extends a distance of at least 25% of the axial length of the outer wall. Both single and dual muffler systems are described. Methods of use and operation are also provided.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: July 4, 2000
    Assignee: Donaldson Company, Inc.
    Inventors: Theodore G. Angelo, John Hamrin, Eivind Stenersen, John Hiemstra, Wayne M. Wagner, Ted J. Wiegandt