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. 20, 2014
Filed:
Apr. 24, 2009
Applicants:
Patrick Notté, Wavre, BE;
Albert Devaux, Mont-Saint-Guibert, BE;
Inventors:
Patrick Notté, Wavre, BE;
Albert Devaux, Mont-Saint-Guibert, BE;
Assignee:
Straitmark Holding AG, Zug, CH;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 25/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for the manufacture of concentrated phosphorous acid starting from pure POis disclosed. The POis hydrolyzed, preferably under stirring in water in the presence of a homogeneous Broensted acid catalyst while maintaining in the hydrolysis/reaction medium a pH below 5 whereby the free water level, at the completion of the hydrolysis, is in the range from 0 to 40%.