Patents by Inventor Dennis J. Cahalan

Dennis J. Cahalan 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).

  • Verticle probe card for attachment within a central corridor of a magnetic field generator
    Patent number: 6556031
    Abstract: A vertical probe card assembly containing a plurality of vertical probe cards is mounted within a central corridor or opening within a magnetic field generator. Each of the vertical probe cards has a multiplicity of probe needles extending downwardly therefrom for electrically contacting test pads of a device under test that is positioned below the magnetic field generator.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: April 29, 2003
    Assignee: Veeco Instruments Inc.
    Inventors: James M. Forbis, Dennis J. Cahalan
  • Vertical probe card for attachment within a central corridor of a magnetic field generator
    Publication number: 20020101254
    Abstract: A vertical probe card assembly containing a plurality of vertical probe cards is mounted within a central corridor or opening within a magnetic field generator. Each of the vertical probe cards has a multiplicity of probe needles extending downwardly therefrom for electrically contacting test pads of a device under test that is positioned below the magnetic field generator.
    Type: Application
    Filed: March 19, 2002
    Publication date: August 1, 2002
    Inventors: James M. Forbis, Dennis J. Cahalan
  • Vertical probe card for attachment within a central corridor of a magnetic field generator
    Patent number: 6359453
    Abstract: A vertical probe card assembly containing a plurality of vertical probe cards is mounted within a central corridor or opening within a magnetic field generator. Each of the vertical probe cards has a multiplicity of probe needles extending downwardly therefrom for electrically contacting test pads of a device under test that is positioned below the magnetic field generator.
    Type: Grant
    Filed: February 23, 1999
    Date of Patent: March 19, 2002
    Assignee: Veeco Instruments Inc.
    Inventors: James M. Forbis, Dennis J. Cahalan
  • Method and circuitry to provide true voltage bias to a magnetoresistive head
    Patent number: 5309294
    Abstract: The present invention is directed to a circuit and method for nullifying a drop in the voltage across an MR head caused a parasitic cable resistance. The invention uses local modeling of the cable resistance in order to generate a nulling voltage, equal in magnitude to the voltage across the cable resistance. The magnitude of the nulling voltage is adjusted as the resistance of the MR head varies within a population of heads. The nulling voltage is added to the bias voltage, in order to negate the effect of the cable resistance.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: May 3, 1994
    Assignee: Rocky Mountain Magnetics, Inc.
    Inventor: Dennis J. Cahalan