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. 22, 2008
Filed:
Jan. 25, 2006
Applicants:
Karlheinz Giselbrecht, Pasching, AT;
Wolfgang Hillisch, Leonding, AT;
Inventors:
Karlheinz Giselbrecht, Pasching, AT;
Wolfgang Hillisch, Leonding, AT;
Assignee:
DSM Fine Chemicals Austria NFG GmbH & Co KG, Linz, AT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 45/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for producing aqueous ortho-phthalaldehyde solutions which comprises introducing an acetal of the o-phthalaldehyde into water and subsequently setting a pH <7 by adding an acid, whereupon, then at a temperature between 10° C. and 90° C., the acetal is converted into the o-phthalaldehyde by eliminating the corresponding alcohol, and also use of OPA acetals for producing these solutions.