@misc{LauthHoelderichHarthetal.1996,
  author    = {Lauth, Jakob and Hoelderich, Wolfgang and Harth, Klaus and Hibst, Hartmuth},
  title     = {Coated catalysts : United States Patent ; patent number 5,559,065 ; date of patent: Sep. 24, 1996 / assignee: BASF Aktiengesellschaft},
  publisher = {[United States Trademark and Patent Office]},
  address   = {[Alexandria, VA]},
  pages     = {7 S.},
  year      = {1996},
  language  = {en}
}
@misc{LauthHagemeyerLautensacketal.1999,
  author    = {Lauth, Jakob and Hagemeyer, Alfred and Lautensack, Thomas and Deimling, Axel},
  title     = {Catalyst and catalytic oxidative dehydrogenation of alkylaromatics and paraffins : United States Patent ; patent number 5,902,918 ; date of patent: May 11, 1999 / Assignee: BASF Aktiengesellschaft. Inventors: Alfred Hagemeyer ; Gunter Lauth ; Thomas Lautensack ; Axel Deimling},
  publisher = {United States Trademark and Patent Office},
  address   = {[Alexandria, VA]},
  pages     = {6 S.},
  year      = {1999},
  language  = {en}
}
@misc{SponagelGrafGross1989,
  author    = {Sponagel, Stefan and Graf, G{\"u}nter and Groß, Heinz},
  title     = {Method for the manufacture of a sealing ring with a sealing lip having hydrodynamically acting return elements : United States Patent 4,850,097 ; date of patent: Jul. 25, 1989 / assignee: Firma Carl Freudenberg. Inventors: Gunter Graf ; Heinz Gross ; Stefan Sponagel},
  publisher = {[United States Patent and Trademark Office]},
  address   = {[Alexandria, VA]},
  pages     = {4 S. : Ill.},
  year      = {1989},
  language  = {en}
}
@misc{SponagelGrafGross1989,
  author    = {Sponagel, Stefan and Graf, G{\"u}nter and Groß, Heinz},
  title     = {Method for manufacturing a sealing ring : United States Patent 4,861,536 ; date of patent: Aug. 12, 1989 / assignee: Firma Carl Freudenberg. Inventors: Gunter Graf ; Heinz Gross ; Stefan Sponagel},
  publisher = {[United States Patent and Trademark Office]},
  address   = {[Alexandria, VA]},
  pages     = {5 S. : Ill.},
  year      = {1989},
  language  = {en}
}
@misc{SponagelWachowitz1992,
  author    = {Sponagel, Stefan and Wachowitz, Waldemar},
  title     = {Shaft seal : United States Patent 5,143,385 ; date of patent: Sep. 1, 1992 / assignee: Firma Carl Freudenberg},
  publisher = {[United States Patent and Trademark Office]},
  address   = {[Alexandria, VA]},
  pages     = {5 S. : Ill.},
  year      = {1992},
  language  = {en}
}