US Patent 7449050 System, apparatus and method for concentrating chemical vapors

An apparatus for concentrating a vaporous substance, which comprises: a sorbent material capable of capturing a vaporous substance; a first housing in which the sorbent material is located, a heating element proximate the exterior of the housing; a second housing defining a chamber within which the first housing resides, the first housing being located in said chamber such that there is a space permitting gas flow between the outside of the first housing and the inside of the second housing; and a pump capable of causing an exhaust gas to flow through the space in contact with the outside of the first housing; and methods for making and utilizing such apparatus.