Granted Patent
Utility
US 4,975,207 · App. 07/226,589
Impact modified polyurethane blends
Inventor:
Biing-Lin Lee
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Aug 1, 1988
Inventor
Biing-Lin Lee
Assignee (at issue)
B. F. Goodrich Company
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.