Patents by Inventor Johannes H. C. Franssen

Johannes H. C. Franssen 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 of manufacturing a thin-film magnetic head and magnetic head
    Patent number: 5217819
    Abstract: For a tape contact face to be formed in a thin-film magnetic head having at least one transducing element, by removing material, a reference plane (29) corresponding to the tape contact face is detected by means of a plurality of markers (27A-27J) juxtaposed in a layer and extending transversely to the tape contact face, which markers have first end portions (27A1-27J1) pointing in one direction and second, spatially separated end portions (27A2-27J2) pointing in an opposite direction, with the second end portions located at different distances from the reference plane, inclined with respect to the reference plane, and adjoining each other steplessly.
    Type: Grant
    Filed: May 8, 1991
    Date of Patent: June 8, 1993
    Assignee: U.S. Philips Corporation
    Inventors: James R. Peterson, Johannes F. De Proost, Gerardus H. J. Somers, Franciscus A. Pronk, Victor Zieren, Helmut J. Gassen, Johannes H. C. Franssen, Rudolf A. Van Doorn