Patent ID: 6077336
Filing Date: 2000-06-20
Classification: A61L,B01D,F24F

Abstract:
An air filter system comprising:a filter element frame having an airflow window;a scent impregnated filter element held within said filter element frame;a user notification system mounted in connection with said filter element frame; andmultiple scent impregnated strips positioned on side surfaces of said filter element frame; each of said multiple scent impregnated strips being covered with a peel off cover strip;said scent impregnated filter element being held within said filter element frame and across said air flow window of said filter element frame;said user notification mechanism including a digital control circuit, an on/off switch in connection with an on/off input of said digital control circuit, a pause switch in connection with a pause input of said digital control circuit, and a speaker in connection with a speaker output of said digital control circuit;said digital control circuit starting a first countdown period in response to an ""on"" signal at said on/off input;said digital control circuit generating a first sequence of speaker activation signals on said speaker output at a first predetermined interval upon expiration of said first countdown period;said first sequence of speaker activation signals lasting for a first sequence period in said absence of an ""off"" signal at said on/off input;said digital control circuit generating a second sequence of speaker activation signals on said speaker output at a second predetermined interval less than said first predetermined interval upon expiration of said first sequence period;said digital control circuit starting a second countdown period in response to receipt of a pause activation signal on said pause input;said second countdown period being shorter than said first countdown period;said digital control circuit generating a third sequence of speaker activation signals on said speaker output at said first predetermined interval upon expiration of said second countdown period;said third sequence of speaker activation signals lasting for a third sequence period in said absence of an ""off"" signal on said on/off input;said digital control circuit generating a fourth sequence of speaker activation signals on said speaker output at said second predetermined interval less than said first predetermined interval upon expiration of said third sequence period.