Patents by Inventor Petrus A. M. Van Dorst

Petrus A. M. Van Dorst 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 scandate cathode with scandium oxide film
    Patent number: 5064397
    Abstract: For maintaining a monolayer of scandium which is necessary for a satisfactory emission on the surface of a scandate cathode, at least the top layer of the cathode is provided with scandium coated with a scandium oxide film. Even after repeated ion bombardment the emission is found to recover up to approximately 90% of the initial value at a current density of ca. 100 A/cm.sup.2.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: November 12, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Jan Hasker, Jacobus E. Crombeen, Petrus A. M. Van Dorst, Johannes Van Esdonk, Pieter Hokkeling, Josef J. Van Lith