Patents by Inventor Johannes A. M. Tolboom

Johannes A. M. Tolboom 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).

  • Soft magnetic multilayer film and magnetic head provided with such a soft magnetic multilayer film
    Patent number: 5234775
    Abstract: The invention relates to a soft magnetic multilayer film which comprises a number of crystalline main layers and a number of amorphous secondary layers, the main layer substantially exclusively comprising iron as the magnetic constituent, and the secondary layer comprising mainly iron as the magnetic constituent. Such multilayer films exhibit a relatively low magnetostriction constant which is almost not influenced by temperature treatments. Such films are very suitable for use in magnetic heads.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: August 10, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Franciscus W. A. Dirne, Hendrik J. De Wit, Cornelis H. M. Witmer, Johannes A. M. Tolboom, Peter Lasinski