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:
Aug. 03, 1982
Filed:
Dec. 22, 1980
Robert A Sanford, Prospect, KY (US);
Brown & Williamson Tobacco Corporation, Louisville, KY (US);
Abstract
A filter for a cigarette includes a porous filter rod having a hollow tube therein extending from one end a preselected distance, the filter rod being circumscribed by a non-porous wrapper wherein the filter rod with the non-porous wrapper therearound is provided with at least one groove extending from one end thereof a preselected distance longitudinally therealong. The groove and the tube may extend from the same one end or may extend from opposite ends. Tipping material circumscribes the non-porous wrapper and is provided with flow-throgh openings therein in flow communication with the groove. The groove may be oriented to extend to the mouth end of the filter or the tobacco end when connected to a cigarette.