| 摘要 |
1,171,853. Tobacco smoke filters. H. J. FROHLING. 23 March, 1967 [25 March, 1966], No. 13720/67. Heading A2C. A cigarette filter comprises cellulose acetate fibre or fleece impregnated with at least one amino ether such as 2-ethoxyethylamine. The filter may additionally include an alkyl ester of a carboxylic acid with or without glycerine triacetate. |
