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:
Nov. 01, 1977
Filed:
Feb. 21, 1975
Applicant:
Inventors:
Ernst Hoeger, Neuhofen, DT;
Franz Baskovic, Goennheim, DT;
Assignee:
Benckiser-Knapsack GmbH, Ladenburg am Neckar, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21C / ; D21H / ; D21H / ;
U.S. Cl.
CPC ...
162 76 ; 162 80 ; 162158 ; 1621 / ; 1621 / ; 162D / ;
Abstract
The difficulties encountered in the manufacture of paper, cardboard, and other cellulosic articles, as they are caused by the formation of resinous or pitch deposits on the paper as well as on the paper machines and processing apparatus, are overcome, or at least considerably reduced, by the addition of phosphonic acids and more particularly of alkyl, amino or hydroxy alkyl, or cycloalkyl phosphonic acids or their alkali metal salts. If required, amino polycarboxylic acids, hydroxy carboxylic acids, or their alkali metal salts, or alkali metal polyphosphates are also added during processing.