Patents by Inventor Rolf Lotthammer

Rolf Lotthammer 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).

  • Dispenser cathode with porous sintered compacted metal dispenser body containing chromium oxide
    Patent number: 5594299
    Abstract: A dispenser cathode including a dispenser body formed of a metal matrix and an emission surface formed of emission material impregnated into the dispenser body metal matrix. The metal matrix is a porous sintered metal matrix containing at least one metal frown a first group (W, Mo, Cr) and at least one metal of a second group (Fe, Co, Ni, Ru, Rh, Pd, Re, Os, Ir, Pt) and chromium oxide. The chromium oxide and the metals from the two groups are provided as a powder mixture to form the matrix. The emission material includes at least two alkaline earth metal oxides such as CaO, BaO and at least one oxide of a metal of group IIIa or IIIb of the Periodic Table. The oxide of a metal group is Al.sub.2 O.sub.3.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: January 14, 1997
    Assignee: Licentia Patent-Verwaltungs-GmbH
    Inventors: Frank Bossert, Manfred Hacker, Rolf Lotthammer
  • Dispenser cathode and process for preparing it
    Patent number: 5318468
    Abstract: A dispenser cathode with multilayer sintered body is suggested, wherein the layers have a thickness of between 0.01 and 10 mm and have different compositions.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: June 7, 1994
    Assignee: Licentia Patent-Verwaltungs-GmbH
    Inventors: Rolf Lotthammer, Frank Bossert, Manfred Hacker