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. 05, 1977
Filed:
Feb. 06, 1976
Applicant:
Inventor:
Rene C Pasche, Lausanne, CH;
Assignee:
Baumgartner Papiers S.A., , CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A24B / ;
U.S. Cl.
CPC ...
131-9 ; 1312 / ; 131263 ;
Abstract
A cigarette filter tip comprises three filter elements disposed end-to-end within a tubular outer coating of transparent sheet material. The two filter elements at the ends of the filter tip are of fibrous material while the central element is granular and comprises an iron sulfate which changes color upon reaction with hydrogensulfide in the cigarette smoke to form an iron sulfide. A paper band which units the tip with the cigarette extends only around one of the fibrous filter elements of the tip, thus leaving the granular filter element wholly visible.