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:
Sep. 04, 1984
Filed:
Aug. 23, 1982
Applicant:
Inventors:
Colin L Browne, Clover, SC (US);
Charles H Keith, Charlotte, NC (US);
Peter J Bohlander, Charlotte, NC (US);
Assignee:
Celanese Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A24D / ;
U.S. Cl.
CPC ...
131336 ; 131338 ; 131339 ; 131344 ; 131362 ;
Abstract
A compound cigarette filter, the filter having the ability to deliver substantially constant tar and nicotine as the cigarette is smoked. The compound filter comprises a barrier positioned upstream and in abutting relationship with at least one filter segment, the barrier containing passageways permitting the passage of smoke from a tobacco column to the filter segment, the total cross-sectional passageway area being from 0.5 to 3 square millimeters, the compound filter having an initial totally encapsulated pressure drop of at least 90 mm. H.sub.2 O.