Granted Patent
Utility
US 4,956,513 · App. 07/258,387
Recovery of BF.sub.3 from olefin oligomer process
Inventors:
Howard W. Walker, Ronny W. Lin
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Oct 17, 1988
Inventors
Howard W. Walker
Ronny W. Lin
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.