The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2009
Filed:
Feb. 03, 2006
Joel E. Adair, Racine, WI (US);
Brian T. Davis, Burlington, WI (US);
Gopal P. Ananth, Racine, WI (US);
Padma Prabodh Varanasi, Racine, WI (US);
Joel E. Adair, Racine, WI (US);
Brian T. Davis, Burlington, WI (US);
Gopal P. Ananth, Racine, WI (US);
Padma Prabodh Varanasi, Racine, WI (US);
S.C. Johnson & Son, Inc., Racine, WI (US);
Abstract
Heated volatile dispensers are disclosed that are provided with automated dye-based use-up indicators. Multiple migrateable dyes of different colors are positioned adjacent a porous substrate. Heating of the substrate, such as a slab impregnated with an insect repellent, both causes the impregnated chemical to dispense from the slab and the indicator dyes to migrate to one or more visible positions. One dye migrates to a visible position faster than a dye of a different color. Further heating may cause one or both dyes to change color at a visible position. The dye movement imparts information about the degree of use-up of the impregnating chemical.