Patents by Inventor Peter J. G. M. Janssen

Peter J. G. M. Janssen 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).

  • Vacuum system
    Patent number: 5013384
    Abstract: An inlet opening in an evacuatable vacuum system is substantially enlarged and closed off by a porous plate so that the ingress of dust is avoided and a very uniform inflow of gas is realized. A similar plate can be used for closing off a gas outlet opening of the vacuum chamber.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: May 7, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Willem F. Mellink, Peter J. G. M. Janssen, Jan Zwier, Harm Lotterman