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:
May. 09, 1989
Filed:
Jun. 30, 1987
Applicant:
Inventors:
Stephan Kleemann, Schriesheim, DE;
Werner Ehret, Wilhelmsfeld, DE;
Assignee:
Benckiser-Knapsack GmbH, Ladenburg, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07F / ; C07C / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
2605 / ; 562606 ; 562607 ;
Abstract
An improved process for the preparation of vinyldiphosphonic acid is disclosed. The process involves elimination of a volatile acid from a 1-(O-acyl)-ethane-1,1-diphosphonic acid. The starting materials may be prepared by reacting 1-hydroxyethane-1,1-diphosphonic acid with the corresponding acid or directly by reacting the acid with phosphorous acid and an acyl anhydride.