Patents by Inventor Klaas B. Klassen

Klaas B. Klassen 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).

  • High-transition-rate, low-supply-voltage write driver circuitry for magnetic inductive write head
    Patent number: 5296975
    Abstract: Writing of data on a storage disk by an inductive magnetic transducer is modulated by write driver circuitry that includes a supply voltage as low as three volts provided by a source referenced to ground, and a bias current source connected to either the supply voltage source or ground. Two bias control switches respectively direct the bias current to one or the other of two current gain circuits according to whether a positive or a negative input terminal has a preselected polarity. The gain circuits selectively respond to the bias currents supplied by the associated control switch for amplifying the bias current to remove a write current from a respective associated terminal of the transducer.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: March 22, 1994
    Assignee: International Business Machines Corporation
    Inventors: John T. Contreras, Stephen A. Jove, Klaas B. Klassen, Jacobus C. Leonardus van Peppen