Granted Patent
Utility
US 4,258,187 · App. 05/959,626
Process for preparing quinazolinone oxides
Inventor:
William J. Middleton
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Nov 13, 1978
Inventor
William J. Middleton
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.