Granted Patent
Utility
US 4,883,831 · App. 07/284,574
Melamine-based light stabilizers for plastics
Inventors:
Richard V. Nelson, John F. Stephen
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Dec 15, 1988
Inventors
Richard V. Nelson
John F. Stephen
Assignee (at issue)
ICI Americas, Inc.
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.