Patents by Inventor Alois Kramer

Alois Kramer 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: 4308088
    Abstract: A method for producing hexagonal, laminar, alpha aluminum oxide monocrystals having a grain size of about 16 to about 250 microns, and a diameter to thickness ratio of about 3:1 to about 7:1. Aluminum hydroxide of particle size greater than 60 microns is calcined in the presence of a fluorine-containing mineralizer at a temperature of greater than 1200.degree. C. but no more than 1450.degree. C., and the desired grain size is separated from the calcinate.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: December 29, 1981
    Assignee: Giulini Chemi GmbH
    Inventors: Egon Cherdron, Heinz Hellinghausen, Alois Kramer, Horst Pohland, Avraham Metzer
  • Patent number: 4130402
    Abstract: Coarsely crystalline aluminum oxide is provided which contains the following trace elements: V.sub.2 O.sub.5 > 0.005 percent by weight, P.sub.2 O.sub.5 > 0.005 percent by weight, Na.sub.2 O > 0.8 percent by weight.A method is provided for producing such an aluminum oxide by calcining aluminum hydroxide in the presence of at least one flouride and of vanadium salt.
    Type: Grant
    Filed: May 24, 1977
    Date of Patent: December 19, 1978
    Assignee: Guilini Chemie G.m.b.H.
    Inventors: Bernhard Schepers, Heinz Hellinghausen, Alois Kramer