Patents by Inventor Hendrikus Josephus Antonius Van Dijk

Hendrikus Josephus Antonius Van Dijk 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 device comprising a semiconductor body
    Patent number: 3968565
    Abstract: The invention relates to a method of manufacturing a device, for example, a magnetic head for recording and playing back information on a magnetisable medium.In this method, a substrate of semiconductor material is profiled by a selective electrolytic etching process.Preceding the etching process, the part of the substrate to be removed by said process is formed by a local doping treatment, for example, by diffusion.The doping treatment may be carried out in several overlapping steps.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: July 13, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Theodorus Cornelius Johannes Maria Bertens, Hendrikus Josephus Antonius Van Dijk, Jan T. Gerkema