|
| US4040042 | 13 Jul 1976 | 2 Ago 1977 | | Exhaust apparatus and monitoring circuit therefor |
| US4604111 | 20 May 1985 | 5 Ago 1986 | | Particulate contamination control method and filtration device |
| US5014338 | 21 Dic 1988 | 7 May 1991 | | Portable air humidifier |
| US5120919 | 26 Dic 1989 | 9 Jun 1992 | Bull, S.A. | Cabinet for a machine cooled by ventilation |
| US5131932 | 11 Sep 1990 | 21 Jul 1992 | Bionaire, Inc. | Filter replacement indicator |
| US5315838 | 16 Ago 1993 | 31 May 1994 | Whirlpool Corporation | Air conditioner filter monitor |
| US5343551 | 7 May 1993 | 30 Ago 1994 | | Humidifier with removable vaporizing unit for ready access to heating element and evaporation chamber |
| US5351035 | 22 Feb 1993 | 27 Sep 1994 | Ben A. Everson | Clogged filter indicator |
| US5378254 | 15 Oct 1993 | 3 Ene 1995 | Vaportek, Inc. | Filter sensing apparatus and filter therefor |
| US5461368 | 11 Ene 1994 | 24 Oct 1995 | Comtech Incorporated | Air filter monitoring device in a system using multispeed blower |
| US6186140 | 14 Mar 1997 | 13 Feb 2001 | 3M Innovative Properties Company | Respiratory filter element having a storage device for keeping track of filter usage and a system for use therewith |
| US7757340 | 25 Mar 2005 | 20 Jul 2010 | S.C. Johnson & Son, Inc. | Soft-surface remediation device and method of using same |
