Patent ID: 8066005
Filing Date: 2011-11-29
Classification: A62B

Abstract:
1. A complex respirator comprising: at least one first filter layer having longitudinal and transverse dimensions defining a first area; a shell formed of a gas impermeable material and disposed on an inner side of the first filter layer, the shell including an outer edge defined about a central portion having at least one air hole formed therethrough disposed in correspondence with the first filter layer; and a second filter layer having longitudinal and transverse dimensions defining a second area, the second area being greater than the first area, the second filter layer being joined to the outer edge of the shell to be substantially in peripheral alignment with the shell to form an air chamber and remain spaced from an inner side of the shell by the air chamber, the air chamber extending between the inner side of the shell and the second filter layer peripherally beyond the first filter layer to provide a peripherally expanded air buffering space about the air hole of the shell.