Patents by Inventor Jacob de Groot

Jacob de Groot 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).

  • Core containing amorphous ferromagnetic strip material
    Patent number: 4635018
    Abstract: A core for an inductor or transformer includes a number of concentric turns of a ferromagnetic strip material. An inner core portion (13) consists of a non-amorphous material and an outer core portion (27) consists of an amorphous material. The transition between the two core portions (13, 27) is formed by a welded joint between the overlapping outer (17) and inner (15) end portions of the outer turn of the inner core portion (13), and with the inner end portion (19) of the inner turn (33) of the outer core portion (27) disposed therebetween.
    Type: Grant
    Filed: February 4, 1986
    Date of Patent: January 6, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Jacob de Groot, Thomas A. J. Haus