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:
May. 07, 1991
Filed:
Dec. 28, 1987
Applicant:
Inventors:
Richard A Thesing, Richmond, VA (US);
Walter A Nichols, Richmond, VA (US);
Assignee:
Philip Morris Incorporated, Richmond, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A24D / ; A24D / ;
U.S. Cl.
CPC ...
131344 ; 131335 ; 131340 ; 493 39 ; 493 42 ; 493 47 ; 493 49 ;
Abstract
A cigarette filter has a substantially cylindrical inner member of filter material surrounded by an outer member of filter material and a plugwrap. The density of the inner and outer members are typically different, and a flavorant is added to at least one of the members. Methods and apparatus for making the filter are also disclosed.