Granted Patent
Utility
US 4,520,171 · App. 06/375,260
Polymeric hindered amines
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: May 5, 1982
Assignee (at issue)
HERCULES LLC
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.