| US 7,544,332 B2 | ||
| Air treatment dispensers delivering multiple chemicals | ||
| Ranjit A. De Silva, Racine, Wis. (US); Brian T. Davis, Burlington, Wis. (US); and Gopal P. Ananth, Racine, Wis. (US) | ||
| Assigned to S.C. Johnson & Son, Inc., Racine, Wis. (US) | ||
| Filed on Mar. 12, 2007, as Appl. No. 11/684,707. | ||
| Prior Publication US 2008/0226493 A1, Sep. 18, 2008 | ||
| Int. Cl. A61L 9/03 (2006.01) | ||
| U.S. Cl. 422—125 [239/53] | 13 Claims |
| 1. An air treatment chemical dispensing system, comprising:
a first substrate bearing a first volatile air treatment chemical capable of being dispensed from the first substrate when
the first substrate is heated;
a second substrate bearing a second volatile air treatment chemical capable of being dispensed from the second substrate when
the second substrate is heated;
an indicator unit holding a volatile indicator chemical separate from both the first volatile air treatment chemical and the
second volatile air treatment chemical;
wherein the second substrate is in a form of a porous structure stacked over the first substrate and has an opening in the
form of an axial pathway;
wherein the indicator unit is stacked over the second substrate; and
wherein the dispensing system is configured such that heat from the first substrate is able to pass through the axial pathway
of the second substrate to the indicator unit.
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