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US4 patents

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US8312758B2Nov 20, 2012

Apparatus and method for using the speed of sound in photoacoustic gas sensor measurements

TOBIAS PETER12 citations83
US9011584B2Apr 21, 2015

End of service life indicator for respirator

TOBIAS PETER9 citations82
US8616205B2Dec 31, 2013

Respirator with end-of-service-life detection

TOBIAS PETER7 citations81
US9079049B2Jul 14, 2015

Respirators with a sacrificial cartridge for end of service life indication

TOBIAS PETER15 citations76