Granted Patent
Utility
US 5,616,637 · App. 08/614,575
Polyethers containing hindered amine side chains as stabilizers
Inventor:
Alfred Steinmann
Patented Case
View Patent ↗
Granted: Apr 1, 1997
Filed: Mar 13, 1996
Inventor
Alfred Steinmann
Assignee (at issue)
Ciba-Geigy
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.