US 11,052,208 B2
Exhaust valve shroud for a personal protection respiratory device
Desmond T. Curran, Duham (GB); Sabeel Ullah, High Wycombe (GB); and Benjamin H. Cooper, Bishop Auckland (GB)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 16/301,867
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed May 17, 2017, PCT No. PCT/US2017/033014
§ 371(c)(1), (2) Date Nov. 15, 2018,
PCT Pub. No. WO2017/205127, PCT Pub. Date Nov. 30, 2017.
Claims priority of application No. 1609168 (GB), filed on May 25, 2016.
Prior Publication US 2019/0151591 A1, May 23, 2019
Int. Cl. A61M 16/06 (2006.01); A62B 18/10 (2006.01); A61M 16/20 (2006.01); A62B 23/02 (2006.01); F16K 15/14 (2006.01); A61M 16/10 (2006.01)
CPC A61M 16/06 (2013.01) [A61M 16/107 (2014.02); A61M 16/208 (2013.01); A62B 18/10 (2013.01); A62B 23/025 (2013.01); F16K 15/148 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An exhaust valve shroud for a personal protection respiratory device, the shroud comprising a main body defining:
an inlet for receiving exhaled air from an exhalation valve,
an outlet for emitting exhaled air from the shroud, and
a perimeter flow conduit for carrying the exhaled air from the inlet to the outlet,
wherein the perimeter flow conduit includes a bifurcated transition section which receives exhaled air from the inlet in a substantially forward facing direction and directs the exhaled air into first and second substantially downwardly extending flow passages, each of which passages are in communication with the outlet;
wherein the inlet comprises an upper inlet in communication with the perimeter flow conduit and a lower inlet in communication with the outlet via a substantially forwardly extending central flow conduit.