Inventor
SEPPALA HAROLD J
US16 patents
⚠️ This page may combine multiple inventors who share the name “SEPPALA HAROLD J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MINNESOTA MINING & MFG
8 patentsUS5724677AMar 10, 1998
Multi-part headband and respirator mask assembly and process for making same
MINNESOTA MINING & MFG148 citations99
US5325892AJul 5, 1994
Unidirectional fluid valve
MINNESOTA MINING & MFG216 citations99
US5260360ANov 9, 1993
Oil, water and sweat repellent microporous membrane materials
MINNESOTA MINING & MFG240 citations99
US5509436AApr 23, 1996
Unidirectional fluid valve
MINNESOTA MINING & MFG96 citations97
US5352513AOct 4, 1994
Oil, water and sweat repellent microporous membrane materials
MINNESOTA MINING & MFG64 citations96
US5237986AAug 24, 1993
Respirator harness assembly
MINNESOTA MINING & MFG156 citations96
US4980927AJan 1, 1991
Adherent protective collars
MINNESOTA MINING & MFG58 citations93
US5256466AOct 26, 1993
Article for liquid containment and recovery
MINNESOTA MINING & MFG21 citations92
3M INNOVATIVE PROPERTIES CO
8 patentsUS7117868B1Oct 10, 2006
Fibrous filtration face mask having a new unidirectional fluid valve
3M INNOVATIVE PROPERTIES CO75 citations98
US6854463B2Feb 15, 2005
Filtering face mask that has a new exhalation valve
3M INNOVATIVE PROPERTIES CO72 citations98
US6843248B2Jan 18, 2005
Filtering face mask that has a new exhalation valve
3M INNOVATIVE PROPERTIES CO80 citations98
US6148817ANov 21, 2000
Multi-part headband and respirator mask assembly and process for making same
3M INNOVATIVE PROPERTIES CO94 citations98
US7311104B2Dec 25, 2007
Method of making a filtering face mask that has an exhalation valve
3M INNOVATIVE PROPERTIES CO39 citations96
US6070579AJun 6, 2000
Elastomeric composite headband
3M INNOVATIVE PROPERTIES CO66 citations96
US7493900B1Feb 24, 2009
Fibrous filtration face mask having a new unidirectional fluid valve
3M INNOVATIVE PROPERTIES CO25 citations92
US7428903B1Sep 30, 2008
Fibrous filtration face mask having a new unidirectional fluid valve
3M INNOVATIVE PROPERTIES CO35 citations92