Patents by Inventor Gerhard Eder

Gerhard Eder 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).

  • Soil conditioner and a process for its preparation
    Patent number: 5679403
    Abstract: The invention relates to a freely flowable, soil conditioner consisting of a granular perlite with a coating on the externally accessible surface of the perlite grains of unfired clay. The invention also relates to a process for the preparation of the soil conditioner in which a clay slurry is sprayed onto the perlite grains.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: October 21, 1997
    Assignee: Otavi Minen AG
    Inventors: Gerhard Eder, Hans-Joachim Paul
  • Soil conditioner and a process for its preparation
    Patent number: 5578121
    Abstract: The invention relates to a freely flowable, soil conditioner consisting of a granular perlite with a coating on the externally accessible surface of the perlite grains of unfired clay. The invention also relates to a process for the preparation of the soil conditioner in which a clay slurry is sprayed onto the perlite grains.
    Type: Grant
    Filed: April 7, 1994
    Date of Patent: November 26, 1996
    Assignee: Otavi Minen AG
    Inventors: Gerhard Eder, Hans-Joachim Paul