Granted Patent
Utility
US 4,772,713 · App. 07/052,330
Quaternary pyridine salts useful for preparation of 4-substituted pyridines
Inventor:
Laurence J. Nummy
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: May 21, 1987
Inventor
Laurence J. Nummy
Assignee (at issue)
Nepera, Inc.
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.