Owner 3M Innovative Properties Company

Inventors Dwyer, Gary E.; Holmquist-Brown, Thomas W.; Kanukurthy, Kiran S.; Rakow, Neal A.

Agent Freehills

Pub. Number AU-A-2011235311

PCT Pub. Number WO2011/123411

Priority 61/320,440 02.04.10 US

Filing date 29 March 2011

Wipo publication date 6 October 2011

G01N 21/77 Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light - by observing the effect on a chemical indicator

A62B 9/00 Component parts for respiratory or breathing apparatus

A62B 18/08 Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes

G01N 21/27 Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light

G01N 21/31 Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry

G01N 21/55 Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light - Specular reflectivity

G01N 21/88 Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light - Investigating the presence of flaws, defects or contamination