Patents by Inventor Douglas Saunders

Douglas Saunders 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: 6713800
    Abstract: A read sensor for use in a magnetic read head includes a magnetoresistive stack having a plurality of layers, and first and second shield regions positioned adjacent to the magnetoresistive stack. Each of the shield regions includes a first soft magnetic layer for shunting flux from an adjacent track to the shield region instead of the magnetoresistive stack.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: March 30, 2004
    Assignee: Seagate Technology LLC
    Inventors: Erli Chen, Sining Mao, Zheng Gao, Paul Kolbo, Douglas Saunders
  • Publication number: 20040000682
    Abstract: A read sensor for use in a magnetic read head includes a magnetoresistive stack having a plurality of layers, and first and second shield regions positioned adjacent to the magnetoresistive stack. Each of the shield regions includes a first soft magnetic layer for shunting flux from an adjacent track to the shield region instead of the magnetoresistive stack.
    Type: Application
    Filed: June 27, 2002
    Publication date: January 1, 2004
    Applicant: Seagate Technology LLC
    Inventors: Erli Chen, Sining Mao, Zheng Gao, Paul Kolbo, Douglas Saunders
  • Patent number: 6504362
    Abstract: Side-reading of an abutted-junction magnetic transducer is measured by constructing at least one microtrack having a transition density. The transducer is moved relative to the microtrack to identify a plurality of positions of the transducer relative to the microtrack where the transducer provides a predetermined response. The side-reading distance of the transducer is identified from the plurality of positions. In one embodiment, a plurality of microtracks are constructed during different iterations, each having a different transition density, and the positions of the transducer are identified during each iteration relative to the respective microtrack. In another embodiment, the selected transition density has a fundamental frequency, and the position of the transducer is identified relative to the microtrack where the transducer provides the predetermined response at each of a plurality of harmonic frequencies of the fundamental frequency.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: January 7, 2003
    Assignee: Seagate Technology LLC
    Inventors: Douglas Saunders, Juan Fernandez-de-Castro, Erli Chen, Lujun Chen
  • Publication number: 20010053037
    Abstract: Side-reading of an abutted-junction magnetic transducer is measured by constructing at least one microtrack having a transition density. The transducer is moved relative to the microtrack to identify a plurality of positions of the transducer relative to the microtrack where the transducer provides a predetermined response. The side-reading distance of the transducer is identified from the plurality of positions. In one embodiment, a plurality of microtracks are constructed during different iterations, each having a different transition density, and the positions of the transducer are identified during each iteration relative to the respective microtrack. In another embodiment, the selected transition density has a fundamental frequency, and the position of the transducer is identified relative to the microtrack where the transducer provides the predetermined response at each of a plurality of harmonic frequencies of the fundamental frequency.
    Type: Application
    Filed: July 11, 2001
    Publication date: December 20, 2001
    Inventors: Douglas Saunders, Juan Fernandez-de-Castro, Erli Chen, Lujun Chen