Granted Patent
Utility
US 4,264,609 · App. 06/124,808
N-[3-Dimethy lamino-2-(4-pyridinyl)-2-propenylidene]-N-methylmethaniminium chloride hydrochloride, its use in preparing 5-(cyano or carbamyl)-[3,4'-bipyridin]-6(1H)-one and its use as a cardiotonic
Inventors:
Karl O. Gelotte, Chester J. Opalka, Jr.
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Feb 26, 1980
Inventors
Karl O. Gelotte
Chester J. Opalka, Jr.
Assignee (at issue)
Sterling Drug, 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.