Granted Patent
Utility
US 4,874,867 · App. 07/275,583
Tetrazole intermediates to antihypertensive compounds
Inventors:
Paul E. Aldrich, John J. V. Duncia, Michael E. Pierce
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Nov 23, 1988
Inventors
Paul E. Aldrich
John J. V. Duncia
Michael E. Pierce
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.