Patent ID: 7597855
Filing Date: 2009-10-06
Classification: A41D,A62B,B01D,B01J,B32B,F16K,G05D,Y10S,Y10T

Abstract:
1. An adaptive membrane structure comprising first and second membranes, and means to respond to an actuating stimulus that moves the first membrane into contact with the second membrane in a position in which the permeability of the structure to gas, vapor, liquid and/or particulates is decreased, wherein each membrane has an array of holes, and the holes of the first membrane are substantially out of registration, or are out of registration, with the holes of the second membrane, and wherein application of the actuating stimulus is effected by a a sensor, in response to a change in the concentration of an undesirable chemical, biological and/or particulate species, in the environment in which the structure is located.