Inventor · disambiguated record
Harold J. Seppala
Also filed as: SEPPALA HAROLD J
16 granted patents·1 pending application·1,485 citations·filing 1988–2007
96Inventor score
Top patents by PatentIndex Score
17 records- 0199US5260360AOil, water and sweat repellent microporous membrane materialsMINNESOTA MINING & MFG·Filed 1991·Granted Nov 9, 1993·240 cites·11 claims
- 0298US5724677AMulti-part headband and respirator mask assembly and process for making sameMINNESOTA MINING & MFG·Filed 1996·Granted Mar 10, 1998·148 cites·19 claims
- 0397US6843248B2Filtering face mask that has a new exhalation valve3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted Jan 18, 2005·80 cites·43 claims
- 0497US5325892AUnidirectional fluid valveMINNESOTA MINING & MFG·Filed 1992·Granted Jul 5, 1994·216 cites·16 claims
- 0594US7117868B1Fibrous filtration face mask having a new unidirectional fluid valve3M INNOVATIVE PROPERTIES CO·Filed 2000·Granted Oct 10, 2006·75 cites·16 claims
- 0694US6148817AMulti-part headband and respirator mask assembly and process for making same3M INNOVATIVE PROPERTIES CO·Filed 1998·Granted Nov 21, 2000·94 cites·31 claims
- 0793US5509436AUnidirectional fluid valveMINNESOTA MINING & MFG·Filed 1995·Granted Apr 23, 1996·96 cites·16 claims
- 0892US7311104B2Method of making a filtering face mask that has an exhalation valve3M INNOVATIVE PROPERTIES CO·Filed 2001·Granted Dec 25, 2007·39 cites·23 claims
- 0990US5352513AOil, water and sweat repellent microporous membrane materialsMINNESOTA MINING & MFG·Filed 1993·Granted Oct 4, 1994·64 cites·22 claims
- 1089US5237986ARespirator harness assemblyMINNESOTA MINING & MFG·Filed 1991·Granted Aug 24, 1993·156 cites·4 claims
- 1188US6854463B2Filtering face mask that has a new exhalation valve3M INNOVATIVE PROPERTIES CO·Filed 1994·Granted Feb 15, 2005·72 cites·44 claims
- 1288US4980927AAdherent protective collarsMINNESOTA MINING & MFG·Filed 1988·Granted Jan 1, 1991·58 cites·25 claims
- 1387US7428903B1Fibrous filtration face mask having a new unidirectional fluid valve3M INNOVATIVE PROPERTIES CO·Filed 2000·Granted Sep 30, 2008·35 cites·21 claims
- 1482US7493900B1Fibrous filtration face mask having a new unidirectional fluid valve3M INNOVATIVE PROPERTIES CO·Filed 2000·Granted Feb 24, 2009·25 cites·53 claims
- 1582US6070579AElastomeric composite headband3M INNOVATIVE PROPERTIES CO·Filed 1996·Granted Jun 6, 2000·66 cites·41 claims
- 1662US5256466AArticle for liquid containment and recoveryMINNESOTA MINING & MFG·Filed 1992·Granted Oct 26, 1993·21 cites·14 claims
- 1759US2007119459A1Method Of Making A Filtering Face Mask Having New Exhalation Valve3M INNOVATIVE PROPERTIES CO·Filed 2007·Application pending·0 cites
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