Patents by Inventor Frank Weissortel

Frank Weissortel 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).

  • Spiro compounds, and their use
    Patent number: 6861567
    Abstract: The present invention relates to novel spiro compounds of the formula (I):
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: March 1, 2005
    Assignee: Covion Organic Semiconductors GmbH
    Inventors: Hubert Spreitzer, Josef Salbeck, Frank Weissörtel
  • Spiro compounds, and their use
    Publication number: 20030065190
    Abstract: The present invention relates to novel spiro compounds of the formula (I) 1
    Type: Application
    Filed: September 13, 2002
    Publication date: April 3, 2003
    Inventors: Hubert Spreitzer, Josef Salbeck, Frank Weissortel
  • Photovoltaic cell
    Patent number: 6335480
    Abstract: A photovoltaic cell comprising an electrolyte which comprises a hole conductor compound as redox system.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: January 1, 2002
    Assignee: Aventis Research & Technologies GmbH & Co.
    Inventors: Udo Bach, Michael Grätzel, Josef Salbeck, Frank Weissörtel, Donald Lupo