Patent ID: 7622073

Claim:
An apparatus for dispensing active materials, comprising: a housing; and control circuitry disposed within the housing that implements programming for a mode of operation in which during a first sustained period of time a first active material is emitted in the form of discrete bursts each followed by a first dwell period, during a second sustained period of time the first active material is emitted in the form of discrete bursts each followed by a second dwell period and a second active material is emitted in the form of discrete bursts each followed by a third dwell period, wherein during the second sustained period of time the discrete bursts of the first and second active materials are emitted such that when a discrete burst of one of the first and second active materials is emitted, a discrete burst of the other of the first and second active materials is initiated before the discrete burst of the one of the first and second active materials is terminated, and during a third sustained period of time the second active material is emitted in the form of discrete bursts each followed by a fourth dwell period.