Patents by Inventor Hans J. Hagemann

Hans J. Hagemann 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).

  • Patent number: 4477401
    Abstract: A method of manufacturing a dielectric from ferroelectric ceramic material having a perovskite structure with the basic formula ABO.sub.3. In the method, the dielectric is sintered in a reducing atmosphere and the sintered body is aftertreated at a temperature in the range of from 500.degree. to 900.degree. C. in an N.sub.2 --O.sub.2 atmosphere. The atmosphere contains a quantity of O.sub.2 corresponding to a partial O.sub.2 -pressure between 10.sup.-5 bar and 0.2 bar.
    Type: Grant
    Filed: September 2, 1982
    Date of Patent: October 16, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Hans J. Hagemann, Siegfried Hunten, Rolf Wernicke, Cornelius J. Klomp, Willem Noorlander
  • Patent number: 4260663
    Abstract: Only those dielectrics which have a correspondingly low sintering temperature are suitable for the production of ceramic multi-layer capacitors having intermediate electrodes consisting of non-noble metals, such as nickel and cobalt. Suitable are ceramic masses comprising alkaline earth zirconates, wherein up to 10 mole % of the zirconium may have been replaced by titanium; iron or nickel or manganese being added as doping agents to the stoichiometrical perowskite basic compound having a composition of alkaline earth metal (Zr.sub.1-x Ti.sub.x)O.sub.3 where O<x.ltoreq.0.07 and the whole assembly being sintered in a reducing atmosphere.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: April 7, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Hans J. Hagemann, Siegfried Hunten