Granted Patent
Utility
US 4,304,776 · App. 06/144,697
4-Substituted-6-(pyridinyl)-3(2h)-pyridazinones and their use as intermediates and cardiotonics
Inventors:
George Y. Lesher, William B. Dickinson
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Apr 28, 1980
Inventors
George Y. Lesher
William B. Dickinson
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.