Granted Patent
Utility
US 4,824,967 · App. 07/211,941
Process for the preparation of 2-pyrrolidone
Inventors:
Kou-Chang Liu, Paul D. Taylor
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Jun 27, 1988
Inventors
Kou-Chang Liu
Paul D. Taylor
Assignee (at issue)
GAF 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.