US  5,344,626 <br/>
Dual impregnated activated carbon. 

 -  Sep. 6, 1994 
<br/><br/> Pat.file 94 
<br/><br/><label>Subjects--Local Terms: </label><br/>CARBON, ACTIVATED <br/>FILTER <br/>IMPREGNATION <br/>AIR FILTER 
<br/><br/><label>Call Number: </label>US 5,344,626