Granted Patent
Utility
US 4,672,121 · App. 06/691,786
Preparation of 4-substituted pyridines using quaternary pyridine salts
Inventor:
Laurence J. Nummy
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Jan 16, 1985
Inventor
Laurence J. Nummy
Assignee (at issue)
Nepera Chemical Co.
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.