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| US5129926 | 22 Jul 1991 | 14 Jul 1992 | | Engine exhaust system |
| US5143527 | 24 Abr 1991 | 1 Sep 1992 | | Waste gas-purifying device |
| US5198004 | 11 Dic 1991 | 30 Mar 1993 | MAN Gutehoffnungshutte | Activated carbon filter for removing toxic substances, e.g., dioxins and furans, from flue gases prior to entry into the smokestack |
| US5268010 | 16 Jul 1991 | 7 Dic 1993 | | Vacuum cleaner |
| US5395408 | 12 Oct 1993 | 7 Mar 1995 | | Chimney smoke scrubber |
| US5888277 | 9 Sep 1997 | 30 Mar 1999 | Lacidem International Co., Ltd. | Automatic disinfecting means for smoky gas in conduit or closed space |
| US6895954 | 24 Jul 2002 | 24 May 2005 | Gas Research Institute | Scrubber ventilation system |
| US6955715 | 14 Oct 2003 | 18 Oct 2005 | | Water-based air filter system |
