|
| US4677976 | 27 mars 1984 | 7 juil. 1987 | Toyo Cci Kabushiki Kaisha Katsumi Fujinuma | Emergency mask |
| US5357947 | 12 août 1992 | 25 oct. 1994 | | Face mask |
| US5941244 | 28 juil. 1998 | 24 août 1999 | Mitsumasa CHINO | Dustproof mask |
| US6357440 | 16 juin 1999 | 19 mars 2002 | Mallinckrodt Inc. | Pliable respiratory mask |
| US6460539 | 21 sept. 2000 | 8 oct. 2002 | 3M Innovative Properties Company | Respirator that includes an integral filter element, an exhalation valve, and impactor element |
| US6584976 | 24 juil. 1998 | 1 juil. 2003 | 3M Innovative Properties Company | Face mask that has a filtered exhalation valve |
| US6805124 | 12 août 2002 | 19 oct. 2004 | 3M Innovative Properties Company | Face mask that has a filtered exhalation valve |
| US7311104 | 18 avr. 2001 | 25 déc. 2007 | 3M Innovative Properties Company | Method of making a filtering face mask that has an exhalation valve |
| US7428903 | 6 oct. 2000 | 30 sept. 2008 | 3M Innovative Properties Company | Fibrous filtration face mask having a new unidirectional fluid valve |
| US7493900 | 3 oct. 2000 | 24 févr. 2009 | 3M Innovative Properties Company | Fibrous filtration face mask having a new unidirectional fluid valve |
| US8118026 | 27 août 2008 | 21 févr. 2012 | 3M Innovative Properties Company | Filtering face-piece respirator support structure that has living hinges |