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:
Feb. 23, 2021
Filed:
Nov. 29, 2018
Applicant:
Siegfried Ag, Zofingen, CH;
Inventors:
Ernesto Santandrea, Zürich, CH;
Beat Theodor Weber, Zofingen, CH;
Andreas Boudier, Zürich, CH;
Oliver Geiseler, Basel, CH;
Patrick Jeger, Pratteln, CH;
Assignee:
SIEGFRIED AG, Zofingen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 491/08 (2006.01);
U.S. Cl.
CPC ...
C07D 491/08 (2013.01);
Abstract
The present invention relates to the improved synthesis of noroxymorphone of formula (III). Particularly, the invention shows a way how to reduce the impurity level in the product avoiding lengthy purification steps.