Granted Patent
Utility
US 4,468,481 · App. 06/450,206
Flame retardant polyurethane modified polyisocyanurate
Inventors:
Henry J. Barda, Burton J. Sutker, William J. Eldridge
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Dec 16, 1982
Inventors
Henry J. Barda
Burton J. Sutker
William J. Eldridge
Assignee (at issue)
Ethyl 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.