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:
Oct. 01, 1991
Filed:
May. 24, 1989
Applicant:
Inventors:
Paul-Georg Henning, Quickborn, DE;
Gerald Schmekel, Elmshorn, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A24D / ; A24D / ;
U.S. Cl.
CPC ...
131331 ; 131342 ; 131343 ; 131345 ;
Abstract
Fibers of tobacco smoke filters which have been impregnated with dicarboxylic or polycarboxylic acids or anhydrides thereof can be obtained by dissolving anhydrides of dicarboxylic or polycarboxylic acids in volatile or physiologically acceptable organic solvents and applying them to the fibers and, if appropriate, hydrolyzing them with water.