Granted Patent
Utility
US 4,923,987 · App. 07/223,874
Process for the preparation of nitromethylene heterocyclic compounds
Inventors:
Martin Harris, Graham Heyes, Arthur Jackson
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Jul 25, 1988
Inventors
Martin Harris
Graham Heyes
Arthur Jackson
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.