Patent ID: 7622134

Claim:
A method for delivering a volatile material from a dispensing device that uses a heat source to promote release of volatile materials from a substrate by application of heat from a heating surface, the method comprising the steps of: a. providing a substrate of a size and shape selected to fit onto the heating surface, the substrate having: i. 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 ii. the volatile material to be dispensed, disposed in the pores; b. installing the substrate on the heating surface; and c. activating the dispensing device to cause the heating surface to heat to release the volatile material from the pores, which volatile material is then dispensed; wherein the volatile material is an insect control active material and the device is configured such that the volatile material can be dispensed at an insect controlling rate due to application of the heat until the amount of the volatile material remaining in the pores is no more than 10% of an amount of the volatile material present in the pores immediately prior to the activating step and wherein the volatile material is an insect control active material and the device is configured such that the volatile material can be dispensed at an insect controlling rate due to application of the heat until the amount of the volatile material remaining in the pores is no more than 10% of an amount of the volatile material present in the pores immediately prior to the activating step; and wherein the volatile material comprises an insect control active ingredient selected from the group consisting of natural pyrethrins, pyrethrum extract, synthetic pyrethroids, and mixtures thereof.