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David Cook, Raymond Odell, Ian T Petherbridge, Pierre Legare, Robert P Lapointe, Kenneth J Krepel, David M Blomberg, Derek S Baker, James R Betz, Thomas I Insley: Apparatus and method for breathing apparatus component coupling. 3M Innovative Properties Company, Karl G Hanson, James L Young, June 10, 2003: US06575165 (76 worldwide citation)

The present invention relates to a fan-forced positive pressure breathing apparatus commonly known as a Powered Air Purifying Respirators (PAPR) system, and specifically concerns the connecting of the breathing components of such equipment. The invention is a method and apparatus for rapid engagemen ...


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Britton G Billingsley, David M Blomberg, Joy L Manske: Air filtration device having subsections lacking fluid communication. 3M Innovative Properties Company, Craig A Deutsch, December 2, 2014: US08899227 (3 worldwide citation)

A filtering device 10 that includes a housing 12 having a plurality of subsections 32, 34, and 36 where each subsection contains a filter element 26, 28, and 30. An inlet 18 is disposed at a first location on the housing 12, and an upstream air distribution system is placed in fluid communication wi ...


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David M Blomberg, Michael J Cowell, William A Mittelstadt, Carl W Raines III, Nathan A Abel: Sleeve-fit respirator cartridge. 3M Innovative Properties Company, December 6, 2016: US09510626 (1 worldwide citation)

A respirator apparatus includes a respirator body, a filter cartridge receiver integral with and extending from the respirator body, and a filter cartridge. The filter cartridge includes a nozzle element being integral with the filter cartridge. The respirator body and filter cartridge are configure ...


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William A Mittelstadt, Carl W Raines III, David R Stein, Nathan A Abel, David M Blomberg, Michael J Cowell, Gary E Dwyer, Thomas I Insley, Michael J Svendsen: Respirator negative pressure fit check devices and methods. 3M Innovative Properties Company, April 24, 2018: US09950202

A respiratory mask body defining a breathable air zone for a wearer and having a shut-off valve is provided. In an exemplary embodiment, the mask body includes one or more inlet ports configured to receive one or more breathing air source components. The shut-off valve is operable between a closed p ...


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Gary E Dwyer, William A Mittelstadt, Carl W Raines III, Nathan A Abel, David M Blomberg, Michael J Cowell: Respiratory mask having a clean air inlet chamber. 3M Innovative Properties Company, December 13, 2016: US09517367

A respiratory mask body defining a first chamber and a second chamber is provided. In an exemplary embodiment, the mask body includes one or more inlet ports adapted to receive one or more breathing air source components in communication with the first chamber and a fluid intake communication compon ...