Patents by Inventor Hans Limp, deceased

Hans Limp, deceased 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).

  • Cold-cathode ionization vacuum meter with auxiliary ignition system for very low pressure operation
    Patent number: 4847564
    Abstract: A cold-cathode ionization or Penning vacuum meter with an ignition system to increase the meter's usefulness at very low pressures. The ignition system comprises an additional anode and at least one additional cathode mounted adjacent to the primary, measuring, cathode and anode and within the same magnetic field as the primary cathode and anode. The at least one additional cathode and the anode are substantially smaller than the measuring cathode and the anode and serve to ignite or start the ionization of the atomosphere whose pressure needs to be measured.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: July 11, 1989
    Assignee: Keybold Aktiengesellschaft
    Inventor: Hans Limp, deceased