Patents by Inventor Christopher C. Zahn

Christopher C. Zahn 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).

  • Method for calibrating a flying height tester utilizing a wedge slider and transparent disc held together
    Patent number: 5453831
    Abstract: A calibration standard for uniformly calibrating flying height testers. The calibration standard includes a wedge slider held in contact with a glass disc by a load bridge, load spring and cover case. The wedge slider has a first rail and a second rail extending along its length and has a raised end to form an optical wedge between the glass disc and the first and second rails. A profilometer is used to map any surface irregularities on the surfaces of the first and second rails facing the disc, allowing the calculation of an accurate expected distance, or flying height, between the surfaces and the disc at each horizontal location along the length of the wedge slider. The expected flying height is compared to a flying height measured through optical interference techniques to calibrate the flying height tester.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: September 26, 1995
    Assignee: Seagate Technology, Inc.
    Inventors: Yufeng Li, Peter R. Goglia, Christopher C. Zahn
  • Calibration standard for flying height tester having a wedge slider and a transparent disc held together
    Patent number: 5410402
    Abstract: A calibration standard for uniformly calibrating flying height testers. The calibration standard includes a wedge slider held in contact with a glass disc by a load bridge, load spring and cover case. The wedge slider has a first rail and a second rail extending along its length and has a raised end to form an optical wedge between the glass disc and the first and second rails. A profilometer is used to map any surface irregularities on the surfaces of the first and second rails facing the disc, allowing the calculation of an accurate expected distance, or flying height, between the surfaces and the disc at each horizontal location along the length of the wedge slider. The expected flying height is compared to a flying height measured through optical interference techniques to calibrate the flying height tester.
    Type: Grant
    Filed: January 24, 1994
    Date of Patent: April 25, 1995
    Assignee: Seagate Technology, Inc.
    Inventors: Yufeng Li, Peter R. Goglia, Christopher C. Zahn