Granted Patent
Utility
US 4,221,791 · App. 06/040,835
Substituted quinoxaline dioxides
Inventors:
Vernon V. Young, Robert D. Williams, Richard E. Ivy
Patented Case
View Patent ↗
Granted: Sep 9, 1980
Filed: May 21, 1979
Inventors
Vernon V. Young
Robert D. Williams
Richard E. Ivy
Assignee (at issue)
International Minerals & Chemical Corp.
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.