Patents by Inventor Norbert Piel

Norbert Piel 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).

  • Sugar-modified cytostatics
    Patent number: 6271342
    Abstract: The invention relates to cytostatics which, by modification with sugar, are tumor-specific. Suitable spacers ensure serum stability and at the same time an intracellular action.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: August 7, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Georg Lerchen, Karsten von dem Bruch, Uwe Petersen, Jörg Baumgarten, Norbert Piel, Horst-Peter Antonicek, Walter Weichel, Michael Sperzel, Klaus Dieter Bremm
  • Preparation of immunologically active cell wall components from archaebacteria
    Patent number: 5091364
    Abstract: A process for the preparation of glycoproteins and proteins from cultures of archaebacteria, comprising culturing archaebacteria, isolating glycoprotein and/or protein from the archaebacteria or their cell walls, enzymatically degrading the glycoprotein and/or protein, purifying and isolating the degradation products, and separating those fractions in the individual purification steps based on the biological activity of the fraction. The products increase the body's defenses against infection.
    Type: Grant
    Filed: July 25, 1990
    Date of Patent: February 25, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jorg Baumgarten, Helmut Brunner, Inge Flesch, Heinz Hildebrand, Norbert Piel, Michael Sperzel