Granted Patent
Utility
US 4,866,136 · App. 07/085,036
Process for producing polymer bound hindered amine light stabilizers
Inventor:
Ronald E. MacLeay
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Aug 12, 1987
Inventor
Ronald E. MacLeay
Assignee (at issue)
Pennwalt 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.