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:
Oct. 25, 2016
Filed:
Dec. 16, 2011
Applicants:
C. Frederick M. Huntley, East Greenwich, RI (US);
Erik Wayne Kataisto, West Warwick, RI (US);
Knicholaus Dudley LA Lumiere, Groton, CT (US);
Helge Alfred Reisch, Westerly, RI (US);
Inventors:
C. Frederick M. Huntley, East Greenwich, RI (US);
Erik Wayne Kataisto, West Warwick, RI (US);
Knicholaus Dudley La Lumiere, Groton, CT (US);
Helge Alfred Reisch, Westerly, RI (US);
Assignee:
Rhodes Technologies, Coventry, RI (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D 211/68 (2006.01); C07D 211/34 (2006.01);
U.S. Cl.
CPC ...
C07D 211/34 (2013.01);
Abstract
The present invention describes a process for the preparation of methylphenidate hydrochloride. The process involves the esterification of ritalinic acid and methanol in the presence of an acid catalyst at a low temperature. The process may optionally involve the addition of an orthoester.