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| US4619121 | 9 oct. 1984 | 28 oct. 1986 | | Seal for tunnel washing machines |
| US4730400 | 9 déc. 1985 | 15 mars 1988 | | Drum reactor for manufacturing fertilizers and other raw materials by aerobic fermentation |
| US7980002 | 28 janv. 2010 | 19 juil. 2011 | Röhren-und Pumpenwerk Bauer Gesellschaft mbH | Rotary drum for the aerobic heating of pourable solids |