Patents by Inventor Leo Hafner

Leo Hafner 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).

  • Method of preparing fluorine-free rare earth metal compounds from such compounds containing fluorine
    Patent number: 4051219
    Abstract: A rare earth metal salt containing fluorine ions is separated from an acidic solution of the salt in the presence of an amount of boric acid sufficient to sequester the fluorine ions whereby the fluorine ions are bound in the solution and fluorine-free rare earth metal salt is recovered from the solution.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: September 27, 1977
    Assignee: Treibacher Chemische Werke Aktiengesellschaft
    Inventor: Leo Hafner
  • Method for producing a pure cerium oxide
    Patent number: 4049463
    Abstract: The brightness of a cerium oxide is improved by adding a boron compound to a cerium salt or a mixture of cerium salts, and the calcining the mixture in the presence of air in a conventional manner.
    Type: Grant
    Filed: July 21, 1976
    Date of Patent: September 20, 1977
    Assignee: Treibacher Chemische Werke Aktiengesellschaft
    Inventor: Leo Hafner