Granted Patent
Utility
US 4,493,920 · App. 06/566,064
Polymer compositions
Inventor:
Bi Le-Khac
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Dec 27, 1983
Inventor
Bi Le-Khac
Assignee (at issue)
Atlantic Richfield 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.