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:
Dec. 02, 2014
Filed:
Sep. 23, 2010
Applicants:
Rolf Hilfiker, Basel, CH;
Timo Rager, Basel, CH;
Inventors:
Rolf Hilfiker, Basel, CH;
Timo Rager, Basel, CH;
Assignee:
WisTa Laboratories Ltd., Singapore, SG;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 279/18 (2006.01);
U.S. Cl.
CPC ...
C07D 279/18 (2013.01);
Abstract
Substantially pure methylthioninium chloride pentahydrate form A is prepared from methylthioninium chloride by phase equilibration of suspensions, crystallization or solvent evaporation, whereby the water content of the solvent corresponds to a water activity of at least 0.4 at 25° C., and controlled drying of said methylthioninium chloride pentahydrate form A within its stability ranges of humidity, pressure and temperature.