Patents by Inventor Carolus J. Boullart

Carolus J. Boullart 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).

  • Magnetic shielding spring
    Patent number: 4392169
    Abstract: A magnetic tape cassette comprising a housing having an apertured wall to admit a magnetic head, tape guiding means, tape pressure means provided opposite to the aperture and a leaf spring adapted to press the tape pressure means against the tape when a magnetic tape is present in the cassette. The leaf spring consisting of one strip of a soft-magnetic metal alloy having an amorphous structure also serves as a magnetic shielding.
    Type: Grant
    Filed: May 21, 1981
    Date of Patent: July 5, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Carolus J. Boullart, Adrianus C. H. J. Liefkens