Patent classifications
A
HUMAN NECESSITIES
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A24
TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
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A24D
CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
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3/00
Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
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A24D3/02
Manufacture of tobacco smoke filters
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A24D3/0204
Preliminary operations before the filter rod forming process, e.g. crimping, blooming
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A24D3/0212
Applying additives to filter materials
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A24D3/0225
with solid additives, e.g. incorporation of a granular product
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