Patents by Inventor Henricus J. H. Stoffelen

Henricus J. H. Stoffelen 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).

  • Scandate cathode exhibiting scandium segregation
    Patent number: 5006753
    Abstract: By providing at least the top layer of the matrix of a scandate cathode with an alloy or compound which exhibits scandium segregation, a satisfactory recovery for cathodes with a high emission can be achieved after ion bombardment.
    Type: Grant
    Filed: November 15, 1988
    Date of Patent: April 9, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Jan Hasker, Jacobus E. Crombeen, Anton K. Niessen, Henricus J. H. Stoffelen