Filtering tobacco smoke

US3998232A · kind A · utility

Inventor

• Avery B. Smith · Wallingford, US

Key dates

• Filing date: Oct 31, 1974
• Grant date: Dec 21, 1976
• Expiry date: Oct 31, 1994

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A24F7/04
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A tobacco smoke filter cartridge comprises essentially a wrapper of an electrically insulating material, a bed of particles of an electrically conductive or semi-conductive material packed into the filter chamber defined by the wrapper, and two spaced electrodes in electrical contact with the bed of particles for passing an electric current therethrough. The cartridge may be mounted in a cigarette or cigar holder or the stem of a pipe with a miniaturized electric supply circuit built into the holder.