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:
Dec. 18, 1984
Filed:
Apr. 29, 1982
Applicant:
Inventors:
Assignees:
Mitsubishi Acetate Co., Ltd., Tokyo, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
A24D / ;
U.S. Cl.
CPC ...
131336 ; 131340 ; 131341 ; 131344 ;
Abstract
A filter plug having a dual structure comprising filter element A made from a crimped long filter tow in a form of a plug, filter element B, joined to said A, prepared by wrapping a core material consisting of a long fiber tow in a sheet-formed product having grooves which is formed from a material having an air permeability of 8 liters/minute or less and an air permeable wrapping paper and/or a wrapping paper with perforated openings on its periphery which is wrapping therein said filter elements A and B so that the outer grooves parts of the sheet-formed product pass through in the longer direction of the filter plug.