Patents by Inventor Warren K. Harwood

Warren K. Harwood 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).

  • Patent number: 11225091
    Abstract: Examples described herein include examples print media handling system including a first media guide assembly comprising a sensor assembly, and a second media guide assembly comprising a retractable pressure plate and disposed opposite the first media guide assembly to guide a print media along a path between the first media guide assembly and second media guide assembly, the pressure plate moveable about an axis perpendicular to the path between an actuated position and a retracted position.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: January 18, 2022
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Peter J Boucher, Jason Y. Carothers, Warren K Harwood, Luke P Sosnowski
  • Patent number: 7595632
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: September 29, 2009
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 7589518
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: September 15, 2009
    Assignee: Cascade Microtech, Inc.
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Patent number: 7492147
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: February 17, 2009
    Assignee: Cascade Microtech, Inc.
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Patent number: 7348787
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: March 25, 2008
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 7330023
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: February 12, 2008
    Assignee: Cascade Microtech, Inc.
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Patent number: 7009383
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: March 7, 2006
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 6980012
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Grant
    Filed: October 2, 2003
    Date of Patent: December 27, 2005
    Assignee: Cascase Microtech, Inc.
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Patent number: 6801047
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: October 5, 2004
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 6720782
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: April 13, 2004
    Assignee: Cascade Microtech, Inc.
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Publication number: 20040061514
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Application
    Filed: October 2, 2003
    Publication date: April 1, 2004
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Publication number: 20030205997
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Application
    Filed: May 19, 2003
    Publication date: November 6, 2003
    Applicant: Cascade Microtech, Inc., an Oregon corporation
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 6636059
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: October 21, 2003
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Publication number: 20030057979
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Application
    Filed: October 17, 2002
    Publication date: March 27, 2003
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Publication number: 20030048110
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Application
    Filed: October 9, 2002
    Publication date: March 13, 2003
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 6492822
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Grant
    Filed: October 30, 2001
    Date of Patent: December 10, 2002
    Assignee: Cascade Microtech, Inc.
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner
  • Patent number: 6486687
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: November 26, 2002
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Publication number: 20020093353
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Application
    Filed: February 6, 2002
    Publication date: July 18, 2002
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Patent number: 6380751
    Abstract: A wafer probe station is equipped with an integrated environment control enclosure substantially surrounding a supporting surface for holding a test device, such enclosure limiting fluid communication between the interior and exterior of the enclosure and preferably also providing EMI shielding and a dark environment. The limited communication between the interior and exterior of the enclosure is kept substantially constant despite positioning movement of either the supporting surface or probes. The positioning mechanisms for the supporting surface and probes each are located at least partially outside of the enclosure.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: April 30, 2002
    Assignee: Cascade Microtech, Inc.
    Inventors: Warren K. Harwood, Paul A. Tervo, Martin J. Koxxy
  • Publication number: 20020043981
    Abstract: A probe station includes a fully guarded chuck assembly and connector mechanism for increasing sensitivity to low-level currents while reducing settling times. The chuck assembly includes a wafer-supporting first chuck element surrounded by a second chuck element having a lower component, skirting component and upper component each with a surface portion extending opposite the first element for guarding thereof. The connector mechanism is so connected to the second chuck element as to enable, during low-level current measurements, the potential on each component to follow that on the first chuck element as measured relative to an outer shielding enclosure surrounding each element. Leakage current from the first chuck element is thus reduced to virtually zero, hence enabling increased current sensitivity, and the reduced capacitance thus provided by the second chuck element decreases charging periods, hence reducing settling times.
    Type: Application
    Filed: October 30, 2001
    Publication date: April 18, 2002
    Inventors: Randy J. Schwindt, Warren K. Harwood, Paul A. Tervo, Kenneth R. Smith, Richard H. Warner