Patents by Inventor William E. App

William E. App 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).

  • Process for production of high-isoprene butyl rubber
    Publication number: 20090030169
    Abstract: The present invention relates to a process for producing polymers comprising repeating units derived from at least one isoolefin monomer, at least one multiolefin monomer and optionally further copolymerizable monomers in the presence of at least one organic nitro compound and AlCl3/water wherein the process is conducted in the absence of compounds selected from the group consisting of vanadium compounds, zirconium halogenid, hafnium halogenides. Preferably the polymers have a multiolefin content of greater than 2.5 mol %, and a molecular weight Mw of greater than 240 kg/mol.
    Type: Application
    Filed: July 9, 2007
    Publication date: January 29, 2009
    Inventors: R. Resendes, Rudolf Casper, Rotraud Casper, William E. App, Gerhard Langstein, Martin Bohnenpoll, Gabor Kaszas, Stephan Glander
  • Process for production of high-isoprene butyl rubber
    Patent number: 7256244
    Abstract: The present invention relates to a process for producing polymers comprising repeating units derived from at least one isoolefin monomer, at least one multiolefin monomer and optionally further copolymerization monomers in the presence of at least one organic nitro compound and AlCl3/water wherein the process is conducted in the absence of compounds selected from the group consisting of vanadium compounds, zirconium halogenid, and hafnium hallogenides.
    Type: Grant
    Filed: December 3, 2003
    Date of Patent: August 14, 2007
    Assignee: Lanxess Inc.
    Inventors: R. Resendes, Rotraud Casper, legal representative, William E. App, Gerhard Langstein, Martin Bohnenpoll, Gabor Kaszas, Stephan Glander, Rudolf Casper, deceased
  • Process for production of high-isoprene butyl rubber
    Publication number: 20040220328
    Abstract: The present invention relates to a process for producing polymers comprising repeating units derived from at least one isoolefin monomer, at least one multiolefin monomer and optionally further copolymerizable monomers in the presence of at least one organic nitro compound and AlCl3/water wherein the process is conducted in the absence of compounds selected from the group consisting of vanadium compounds, zirconium halogenid, hafnium halogenides.
    Type: Application
    Filed: December 3, 2003
    Publication date: November 4, 2004
    Inventors: R. Resendes, Rotraud Casper, Rudolf Casper, William E. App, Gerhard Langstein, Martin Bohnenpoll, Gabor Kaszas, Stephan Glander