The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 1985
Filed:
Jun. 23, 1982
Ernest B Hayes, Leighton Buzzard, Bedfordshire, GB;
Anthony S Cantell, Milton Keynes, Buckinghamshire both of, GB;
Other;
Abstract
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.