Granted Patent
Utility
US 4,426,543 · App. 06/349,487
Vapor phase nitration of aromatic hydrocarbons
Inventors:
Ignatius Schumacher, Kang-Bo Wang
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Feb 17, 1982
Inventors
Ignatius Schumacher
Kang-Bo Wang
Assignee (at issue)
Monsanto 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.