Other

Ernest B Hayes

Paul Francis Clarke

Anthony S Cantell

A tobacco smoke filter comprising a rod of tobacco smoke filtering material incorporating particulate additive, wherein at least some of the particulate additive is concentrated on one or a restricted number of threads and/or strips incorporated within the remaining body of filtering material, the additive adhering to said thread(s) and/or strip(s).

Tobacco smoke filter containing particulate additive

This invention provides a smoke filter element comprising a filtering core, a smoke impermeable wrapper in surrounding engagement with the core, at least one internal passage defined between the impermeable wrapper and core and open at an end of the element, and at least one external passage defined by the outer surface of the impermeable wrapper and extending to an end of the element; and a cigarette filter comprising such an element having engaged around said impermeable wrapper tipping material which provides, when the filter is drawn on in use, for the ingress of external air laterally therethrough into said external passage(s). The tipping material may be a tipping overwrap incorporating the filter in a filtered cigarette. The impermeable wrapper may have longitudinal corrugations providing the passages, which may extend fully or only partially the length of the wrapper. The impermeable wrapper can have a circumferential groove communicating with the external passage(s), there being air dilution through the tipping material directly into the groove.

Smoke filter

This invention provides a cigarette filter comprising a filter core (2), a plugwrap (4) around the core, a profiled spacer wrap (6) around the plugwrap, and tipping material (8) around the spacer wrap, the profiled spacer wrap providing between the plugwrap and tipping material passages (14,16) which are in lateral air flow communication and extend longitudinally of the filter to open at an end thereof, the tipping material providing in use of the filter for the drawing of external air therethrough directly into at least some of the said passages, and the plugwrap beneath the passages being smoke-impermeable. The spacer wrap may be longitudinally corrugated to provide adjacent longitudinal passages (14,16) which are in air flow communication via apertures (15) through the side walls of the corrugations.

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Leighton Buzzard, Bedfordshire, United Kingdom

Ernest B Hayes