Patents by Inventor Philipp Pister

Philipp Pister 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).

  • Flexible multilayer magnetic recording medium
    Patent number: 4200678
    Abstract: A flexible multilayer magnetic recording medium exhibiting an improved signal-to-print-through ratio coupled with an improved maximum output level and diminished dc noise, comprising a non-magnetic base and, applied thereto, at least two superposed layers consisting of a binder with magnetizable particles uniformly dispersed therein, the upper magnetic layer containing a magnetic pigment giving a signal-to-print-through ratio of less than 55db and the lower magnetic layer(s) containing a magnetic pigment giving a signal-to-print-through ratio of 55 db or more.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: April 29, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Philipp Pister, Franz Buettner, Fritz Hammon, Manfred Ohlinger, Heinz Stritzinger, Job-Werner Hartmann, Walter Schneider