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A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
A24D3/06—Use of materials for tobacco smoke filters
A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
A24D3/166—Silicic acid or silicates
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FR853189D1938-04-191939-04-17Procédé pour débarrasser la fumée de tabac de ses poisons et pour l'améliorer
ExpiredFR853189A
(fr)