Patent ID: 7138130

Claim:
A substrate for use in a volatile dispensing device that actively dispenses volatile material from the substrate, the substrate comprising: granular particles adhered together to form a body having a network of pores and passages, the interior surfaces of which are non-reactive and non-absorptive with respect to the volatile material to be dispensed; and a volatile material disposed in the pores, the volatile material comprising an insect control active ingredient initially deliverable by the dispensing device at an insect controlling rate; wherein activation of the volatile dispensing device releases the volatile material from the pores, which volatile material is then dispensed, and wherein no more than 10% residual volatile material remains in the pores when the dispensing device has reached an end point at which the device has so depleted the volatile material as to no longer be able to deliver the volatile material at the insect controlling rate, and wherein the body includes a keying structure that engages a portion of the dispensing device to secure the body in the dispensing device; and wherein the insect control active ingredient is released from the pores substantially linearly at the insect controlling rate when the volatile dispensing device releases the volatile material from the pores by heating the body, and wherein the insect control active ingredient is selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof.