Granted Patent
Utility
US 4,309,394 · App. 06/138,616
Method of preparing ultraphosphoric acid
Inventor:
Robert B. Hudson
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Apr 9, 1980
Inventor
Robert B. Hudson
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.