Patents by Inventor Waltraud Bickert

Waltraud Bickert 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 medium for test purposes, in particular for calibrating flying heads
    Patent number: 4828895
    Abstract: A magnetic recording medium for test purposes, in particular for calibrating flying heads, consists of a firm substrate which has a raised calibration area in the form of an arc-shaped step of defined length, width, height and hardness. Sharp initial and end edges in conjunction with a defined minimum arc length give easily evaluated measured signals in the low frequency range. The test recording medium can be used for any type of magnetic layer on recording media and/or for heads associated with these.
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: May 9, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Waltraud Bickert, Heide Brunkhorst, Istvan Gergely, Wolfgang Oetzel