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. 23, 1991
Filed:
Dec. 20, 1988
Applicant:
Inventors:
Richmond R Cohen, Hockessin, DE (US);
Gary A Luzio, Bear, DE (US);
Assignee:
Hoechst Celanese Corporation, Bridgewater, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A24D / ; A24D / ; A24D / ;
U.S. Cl.
CPC ...
131342 ; 131332 ; 131341 ; 131345 ; 493 47 ; 493 49 ;
Abstract
A process for improving selective filter retention and pass through properties of cigarette filter elements by treating with polyethyleneimine modified to a predetermined pH range with one or more indicated water soluble organic acids, as a filter modifier composition, and the corresponding filter element and cigarette.