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:
Apr. 08, 1986
Filed:
Feb. 21, 1984
Martin L Reynolds, Louisville, KY (US);
Dorothy M Frank, Louisville, KY (US);
Tilford F Riehl, Louisville, KY (US);
Brown & Williamson Tobacco Corporation, Louisville, KY (US);
Abstract
A filter for a cigarette includes a porous filter rod having a capillary smoke passageway extending coaxially therethrough. The filter rod is circumscribed by a non-porous wrapper and 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 preferably extends from the mouth end of the filter rod. Tipping material circumscribes the non-porous wrapper and is provided with flow-through openings therein in flow communication with the groove. In one embodiment, the filter rod includes a cylindrical collar coaxially located at the mouth end defining a recess, the thickness of the wall of the collar being less than the depth of the groove. In a further embodiment, the filter collar includes a concentric open core member coaxial with and open to the capillary flow passageway with the area between the core member and collar wall being open to the groove. In a still further embodiment, the filter rod includes a cylindrical filter collar located at the mouth end defining a recess, the filter collar covering the open end of the groove at the mouth end of the filter rod.