Granted Patent
Utility
US 4,387,264 · App. 06/259,794
Diolefin monomer purification process for anionic polymerization
Inventor:
Le-Khac Bi
Patented Case
View Patent ↗
Granted: Jun 7, 1983
Filed: May 4, 1981
Inventor
Le-Khac Bi
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.