S. C. Johnson Son, Inc.

Kenneth J Welch

Robert R Emmrich

Brian T Davis

Padma Prabodh Varanasi

Michael J Aulozzi

Stanley J Flashinski

Michael C Fryan

Debra A Strasser

Joel E Adair

Volatile impregnated substrates, such as wicks and mats, that can be used in a dispensing device that uses a heat source or otherwise uses active means to promote the release of the volatile material from the substrate are disclosed. The preferred substrate has a structure including sand particles adhered together by a binder to form a network of pores and passages. The binder is selected from thermoset polymeric materials and mixtures thereof. A volatile material is disposed in the pores before the substrate is installed in the dispensing device. The impregnated substrate is positioned in the dispensing device on or near the heat source of the dispensing device. The heat source is activated thereby elevating the temperature of the substrate such that volatile material is released from the pores. In one embodiment, the sand particles comprise silica sand and the binder is a cured novolac resin.

Substrate for volatile delivery systems

A method of manufacturing an insect coil includes the steps of feeding a sheet of dough material which includes an active insect control ingredient dispersed therein in a first direction, cutting the sheet of dough material with a die to form an insect coil, ejecting the insect coil from the die, and applying an extra dose of active to a specific location on the coil while the coil is being ejected from the die. Preferably, the extra dose of active is applied as a droplet using capillary forces that develop between the upper surface of the insect coil and the droplet itself and is forced through a tube located above the desired location. The insect coil may be tip treated only or may be zone treated at a plurality of spaced locations.

Method of manufacturing an insect coil

A wick assembly is provided for use in a dispensing device that dispenses volatile material from a wick by heat. Two wick sections of differing material are provided in stacked fashion, with a coupler sleeve that can be used to facilitate attachment of the wick structure to a reservoir. One wick section preferably provides control over the rate of dispensing, where the other provides improved thermal resistance and resistance to clogging.

Wick assembly

Substrates are provided for use in a heating and/or blowing device that dispenses volatile material. The substrates are a porous medium (such as porous ceramic) having their interior pores coated by a polymeric material (such as a polysiloxane). The substrate is impregnated with a volatile such as pyrethrum. The substrate is less susceptible to clogging. Also disclosed are methods of making those substrates in which the polymeric material is wicked into the substrate with a volatile solvent.

Growing community of inventors

Racine, WI, United States of America

Kenneth J Welch