Patent classifications
A
HUMAN NECESSITIES
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A24
TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
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A24B
MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
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15/00
Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
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A24B15/18
Treatment of tobacco products or tobacco substitutes
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A24B15/36
containing a heterocyclic ring
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A24B15/38
having only nitrogen as hetero atom
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A24B15/385
in a five-membered ring
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