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:
Mar. 23, 1993
Filed:
Oct. 28, 1991
Applicant:
Inventor:
Richard M Berger, Midlothian, VA (US);
Assignee:
American Filtrona Corporation, Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A24D / ;
U.S. Cl.
CPC ...
131336 ; 131339 ; 493 44 ; 493 45 ;
Abstract
A cigarette filter having a core of synthetic fibrous filter material and an outer plug wrap is provided with a group of longitudinal bores and a group of peripheral channels in the core to improve the filtration efficiency and to balance the distribution of smoke flow over the cross-sectional area of the filter.