Biodegradable cellulose acetate structure and tobacco filter
Cigarette filter and filter material therefor
Cigarette filters
Disintegratable cigarette filter
Filter for cigarette smoke
Filter for removing nitrogen oxides from tobacco smoke
Narrow-cross sectioned fibers for use in tobacco smoker filters
Tobacco filter material and a tobacco filter as produced using t
Tobacco smoke filter
Tobacco smoke filter materials, fibrous cellulose esters, and pr