Patents by Inventor David P. Wallace

David P. Wallace 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).

  • Sensor isolation plane for planer elements
    Patent number: 8053706
    Abstract: Elimination of sodium contamination at the negative terminal of an electrical stri resistance heater (1, FIGS. 2 and 4) for a gas sensor (3) can be accomplished by providing a grounding plane (-18?) electrically connected to system ground and located between the heater (1) and the sensor (3).
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: November 8, 2011
    Assignee: Delphi Technologies, Inc.
    Inventors: James A. Katterman, David P. Wallace, II, David P. Wallace, legal representative, Linda L. Wallace, legal representative
  • Sensor isolation plane for planer elements
    Publication number: 20090255916
    Abstract: Elimination of sodium contamination at the negative terminal of an electrical stri resistance heater (1, FIGS. 2 and 4) for a gas sensor (3) can be accomplished by providing a grounding plane (-18?) electrically connected to system ground and located between the heater (1) and the sensor (3).
    Type: Application
    Filed: July 28, 2006
    Publication date: October 15, 2009
    Inventors: James A. Katterman, David P. Wallace, II, David P. Wallace, SR., Linda L. Wallace
  • ELECTRODE ARRANGEMENT FOR GAS SENSORS
    Publication number: 20080107923
    Abstract: An electrochemical cell, comprising: an electrolyte having a first active exterior surface and a second active exterior surface aligned with the first active exterior surface; a first electrode having a main contact surface area disposed on the first active exterior surface of the electrolyte, wherein the main contact surface area of the first electrode defines a conductive path that does not completely cover the first active exterior surface; a second electrode disposed on the second active exterior surface of the electrolyte; and wherein, the electrochemical cell's resistance to oxygen ions is less than an electrochemical cell having a pair of electrodes configured to cover a greater percentage of the first and second active exterior surface areas.
    Type: Application
    Filed: November 8, 2006
    Publication date: May 8, 2008
    Inventors: David P. Wallace, Paul C. Kikuchi
  • Planar sensor and a method for measuring the temperature of same
    Patent number: 7279133
    Abstract: In a planar oxygen sensor having a pump cell, a reference cell, a sensor chamber and a heating device, a ground plane electrode is provided and includes a sensing portion having a first sense lead and a second sense lead and a measuring portion having a first measuring lead and a second measuring lead, wherein the first measuring lead and the second measuring lead have increased surface area relative to said sensing portion such that the resistance between the first measuring lead and the second measuring lead is reduced and wherein the first measuring lead is disposed so as to be communicated with the first sense lead and the second measuring lead is disposed so as to be communicated with the second sense lead.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: October 9, 2007
    Assignee: Delphi Technologies, Inc.
    Inventors: David K. Chen, David P. Wallace, Da Yu Wang, Walter T. Symons, Paul C. Kikuchi, Yingjie Lin, Lora Thrun, Mark A. Shost, Joseph G. Ralph
  • Planar sensor and a method for measuring the temperature of same
    Publication number: 20030119196
    Abstract: In a planar oxygen sensor having a pump cell, a reference cell, a sensor chamber and a heating device, a ground plane electrode is provided and includes a sensing portion having a first sense lead and a second sense lead and a measuring portion having a first measuring lead and a second measuring lead, wherein the first measuring lead and the second measuring lead have increased surface area relative to said sensing portion such that the resistance between the first measuring lead and the second measuring lead is reduced and wherein the first measuring lead is disposed so as to be communicated with the first sense lead and the second measuring lead is disposed so as to be communicated with the second sense lead.
    Type: Application
    Filed: December 20, 2001
    Publication date: June 26, 2003
    Inventors: David K. Chen, David P. Wallace, Da Yu Wang, Walter T. Symons, Paul C. Kikuchi, Yingjie Lin, Lora Thrun, Mark A. Shost, Joseph G. Ralph