Patents by Inventor Jacobus C. Leonandus van Peppen

Jacobus C. Leonandus van Peppen 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 and circuitry for in-situ measurement of transducer/recording medium clearance and transducer magnetic instability
    Patent number: 5130866
    Abstract: A method and circuitry are described for sensing the clearance between a magnetic transducer and a moving magnetic recording medium in a magnetic disk or tape storage system or alternatively sensing the degree of magnetic instability of a magnetic transducer in such a system. Magnetic transitions prewritten on a preselected area of the medium are read to obtain a readback signal. The width of said signal is sensed at a predetermined amplitude level which is a preselected percentage of its base-to-peak amplitude to provide a voltage corresponding to the width of said signal at said level. The voltage is proportional to the width of the readback signal divided by the time period between successive transitions of identical polarity, so as to provide a measurement of clearance of degree of magnetic instability that is independent of the relative velocity between said transducer and medium.The voltage is digitized and compared to a prestored digital reference value.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: July 14, 1992
    Assignee: International Business Machines Corporation
    Inventors: Klaas B. Klaassen, Jacobus C. Leonandus van Peppen