Granted Patent
Utility
US 5,840,905 · App. 08/033,450
Process for the preparation of 4-hydroxy-1,2,2,6,6,-pentamethylpiperidine
Inventors:
Karl Stephan Nitsche, Walter Wolf, Joachim Fries
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Mar 18, 1993
Inventors
Karl Stephan Nitsche
Walter Wolf
Joachim Fries
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.