Patent ID: 6971386

Claim:
A personal respiratory device for use in a human mouth having lips and teeth, said device comprising: (a) a mouthpiece; (b) a check-valve assembly having at least one air in-flow check valve and at least one air out-flow check valve, said check valve assembly connected to said mouthpiece; (c) at least one air in-flow tube connected to said check valve assembly upstream of said air in-flow check valve; and (d) at least one air filter connected to said air in-flow tube, said at least one air filter in communication with ambient air wherein said personal respiratory device is counterbalanced by a weight distribution of said device, and wherein said (a) mouthpiece and said (b) check-valve assembly are counterbalanced by said (d) at least one air filter connected to said air in-flow tube about an axis posterior to said (a) mouthpiece and anterior to said (d) at least one filter connected to said air in-flow tube.