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:
Jul. 04, 1978
Filed:
May. 23, 1977
Klaus Sommer, Heidelberg, DE;
Guenter Raab, Laudenbach, DE;
Benckiser-Knapsack GmbH, Ladenburg, Neckar, DE;
Abstract
Valuable and highly water soluble N-phosphono methylene mono- and di-amino alkane mono- and polyphosphonic acids which have not only an >N--CH.sub.2 --PO.sub.3 H.sub.2 group but also a C--PO.sub.3 H.sub.2 group in their molecule are produced by reacting amino alkane mono- or diphosphonic acids with formaldehyde and phosphorous acid or alkane nitriles with phosphorous acid, formaldehyde, and concentrated hydrochloric acid. The resulting phosphonic acid compounds are valuable sequestering agents forming complex compounds with bi- and polyvalent metal ions. They are useful for water softening even in substoichiometric amounts, in textile treatment baths, in the paper manufacture, in tanning baths, for the manufacture of liquid fertilizers, and for other purposes.