Granted Patent
Utility
US 5,071,990 · App. 07/592,434
Preparation of intermediates and the synthesis of N-(2-hydroxyethyl)-2-hydroxymethyl-3,4,5-trihydroxypiperidines
Inventor:
Werner Hinsken
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: Oct 4, 1990
Inventor
Werner Hinsken
Assignee (at issue)
Bayer Aktiengesellschaft
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.