Granted Patent
Utility
US 4,119,637 · App. 05/615,951
4-Hydroxymethyl-2-pyrrolidinones
Inventor:
Albert D. Cale, Jr.
Patented Case
View Patent ↗
Granted: Oct 10, 1978
Filed: Sep 23, 1975
Inventor
Albert D. Cale, Jr.
Assignee (at issue)
A. H. Robins Company, Incorporated
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.