Patents by Inventor Carl A. Helms

Carl A. Helms 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).

  • Magnetic recording head having modules with opposing read elements and opposing periodic structures
    Patent number: 7079359
    Abstract: A head includes first and second read modules. The first module has an MR element formed on a wafer having a grating directed along a first direction. The magnetization of the first module element is directed along the first direction. The first module element is biased with a first current directed along a direction such that magnetically stable operation of the element results, that is along an opposite second direction. The second module has an element formed on a wafer having a grating directed along the first direction. The second module is flipped respect to the first module such that the grating is directed along the second direction. The magnetization of the second module element is directed along the second direction. The second module element is biased with a second current directed along the direction opposite to the first current, i.e., the second current is directed along the first direction.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: July 18, 2006
    Assignee: Storage Technology Corporation
    Inventors: Jing He, Joseph M. Schmalhorst, Carl A. Helms, Edward V. Denison
  • Magnetic recording head having modules with opposing read elements and opposing periodic structures
    Patent number: 6970331
    Abstract: A head includes first and second read modules. The first module has an MR element formed on a wafer having a grating directed along a first direction. The magnetization of the first module element is directed along the first direction. The first module element is biased with a first current directed along a direction such that magnetically stable operation of the element results, that is along an opposite second direction. The second module has an element formed on a wafer having a grating directed along the first direction. The second module is flipped respect to the first module such that the grating is directed along the second direction. The magnetization of the second module element is directed along the second direction. The second module element is biased with a second current directed along the direction opposite to the first current, i.e., the second current is directed along the first direction.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: November 29, 2005
    Assignee: Storage Technology Corporation
    Inventors: Jing He, Joseph M. Schmalhorst, Carl A. Helms, Edward V. Denison
  • Track position error determination
    Patent number: 6768606
    Abstract: Nonlinearities in the interaction between a servo read head and a servo track are considered to more accurately determine the position error or offset between the servo read head and the servo track. A position error expression is determined based on a track profile for the servo read head. A servo track signal is generated by reading a servo track with the servo read head. The position error is determined based on the servo track signal and the position error expression.
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: July 27, 2004
    Assignee: Storage Technology Corporation
    Inventor: Carl A. Helms
  • Track position error determination
    Publication number: 20020097518
    Abstract: Nonlinearities in the interaction between a servo read head and a servo track are considered to more accurately determine the position error or offset between the servo read head and the servo track. A position error expression is determined based on a track profile for the servo read head. A servo track signal is generated by reading a servo track with the servo read head. The position error is determined based on the servo track signal and the position error expression.
    Type: Application
    Filed: December 12, 2000
    Publication date: July 25, 2002
    Applicant: Storage Technology Corporation
    Inventor: Carl A. Helms