Inventor
MITTELSTADT WILLIAM A
US50 patents
⚠️ This page may combine multiple inventors who share the name “MITTELSTADT WILLIAM A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
3M INNOVATIVE PROPERTIES CO
34 patentsUS6883518B2Apr 26, 2005
Unidirectional respirator valve
3M INNOVATIVE PROPERTIES CO121 citations99
US7302951B2Dec 4, 2007
Unidirectional respirator valve
3M INNOVATIVE PROPERTIES CO74 citations98
US6732733B1May 11, 2004
Half-mask respirator with head harness assembly
3M INNOVATIVE PROPERTIES CO127 citations98
US6298498B1Oct 9, 2001
Protective helmet system
3M INNOVATIVE PROPERTIES CO90 citations97
US6102033AAug 15, 2000
Attachment system for replacement helmet respirator lens
3M INNOVATIVE PROPERTIES CO116 citations97
US6035451AMar 14, 2000
Protective helmet system with cam for attaching first and second face shields thereto
3M INNOVATIVE PROPERTIES CO84 citations96
US7849856B2Dec 14, 2010
Respirator valve
3M INNOVATIVE PROPERTIES CO26 citations93
USD471627SMar 11, 2003
Respirator facemask assembly
3M INNOVATIVE PROPERTIES CO35 citations93
USD467656SDec 24, 2002
Respirator facemask
3M INNOVATIVE PROPERTIES CO28 citations93
US6279570B1Aug 28, 2001
Filter support, assembly and system
3M INNOVATIVE PROPERTIES CO35 citations93
US7320722B2Jan 22, 2008
Respiratory protection device that has rapid threaded clean air source attachment
3M INNOVATIVE PROPERTIES CO29 citations92
USD787659SMay 23, 2017
Respirator with face seal flexing region
3M INNOVATIVE PROPERTIES CO11 citations84
USD776258SJan 10, 2017
Respirator with face seal multiple flexing region
3M INNOVATIVE PROPERTIES CO10 citations84
US9517367B2Dec 13, 2016
Respiratory mask having a clean air inlet chamber
3M INNOVATIVE PROPERTIES CO12 citations84
US9510626B2Dec 6, 2016
Sleeve-fit respirator cartridge
3M INNOVATIVE PROPERTIES CO14 citations84
USD759807SJun 21, 2016
Respirator mask exhalation port
3M INNOVATIVE PROPERTIES CO6 citations84
USD787660SMay 23, 2017
Respirator mask having a face seal flexing region
3M INNOVATIVE PROPERTIES CO9 citations83
USD779674SFeb 21, 2017
Filter element having a connector
3M INNOVATIVE PROPERTIES CO9 citations81
US9149669B2Oct 6, 2015
Respiratory protection device harness assembly
3M INNOVATIVE PROPERTIES CO9 citations81
USD444218SJun 26, 2001
Portion of a filter support
3M INNOVATIVE PROPERTIES CO6 citations74
US10391338B2Aug 27, 2019
Sleeve-fit respirator cartridge
3M INNOVATIVE PROPERTIES CO5 citations73
US10143864B2Dec 4, 2018
Respirator having noncircular centroid-mounted exhalation valve
3M INNOVATIVE PROPERTIES CO3 citations73
US9247788B2Feb 2, 2016
Personal protective equipment strap retaining devices
3M INNOVATIVE PROPERTIES CO4 citations73
US11052268B2Jul 6, 2021
Respirator negative pressure fit check devices and methods
3M INNOVATIVE PROPERTIES CO5 citations72
US9950202B2Apr 24, 2018
Respirator negative pressure fit check devices and methods
3M INNOVATIVE PROPERTIES CO6 citations72
US11305134B2Apr 19, 2022
Respirator having noncircular centroid-mounted exhalation valve
3M INNOVATIVE PROPERTIES CO1 citations63
USD740932SOct 13, 2015
Respirator with raised face seal flexing region
3M INNOVATIVE PROPERTIES CO3 citations63
US11219787B2Jan 11, 2022
Respirator fit check sealing devices and methods
3M INNOVATIVE PROPERTIES CO0 citations62
US9776023B2Oct 3, 2017
Respiratory mask having a nose support extension
3M INNOVATIVE PROPERTIES CO1 citations52
USD767116SSep 20, 2016
Respirator mask having an exhalation port
3M INNOVATIVE PROPERTIES CO1 citations52
US9259058B2Feb 16, 2016
Personal protective equipment strap retaining devices
3M INNOVATIVE PROPERTIES CO1 citations52
USD743536SNov 17, 2015
Respirator mask having a circular button
3M INNOVATIVE PROPERTIES CO0 citations52
USD742504SNov 3, 2015
Respirator mask
3M INNOVATIVE PROPERTIES CO1 citations52
USD744088SNov 24, 2015
Respirator mask having a circular button
3M INNOVATIVE PROPERTIES CO1 citations51
MINNESOTA MINING & MFG
5 patentsUS5720281AFeb 24, 1998
Eye shield for a respiratory mask
MINNESOTA MINING & MFG67 citations96
US5689833ANov 25, 1997
Eye shield for a respiratory mask
MINNESOTA MINING & MFG50 citations96
USD353668SDec 20, 1994
Pneumoneedle
MINNESOTA MINING & MFG107 citations96
US5374252ADec 20, 1994
Locking pneumoneedle
MINNESOTA MINING & MFG86 citations96
US5011187AApr 30, 1991
Binding system for connected fan folded sheets
MINNESOTA MINING & MFG31 citations91
MITTELSTADT WILLIAM A
3 patents3M INNOVATIVE PROPERTIES COMPANY
3 patentsUS11992078B2May 28, 2024
Headwear suspension attachment element
3M INNOVATIVE PROPERTIES COMPANY2 citations67
US12128259B2Oct 29, 2024
Respirator negative pressure fit check devices and methods
3M INNOVATIVE PROPERTIES COMPANY1 citations62
US11865375B2Jan 9, 2024
Respirator fit check sealing devices and methods
3M INNOVATIVE PROPERTIES COMPANY0 citations62