Granted Patent
Utility
US 4,341,739 · App. 06/060,044
Phosphoric acid ammoniation apparatus
Inventors:
John D. Ellis, George Crichton, Millard C. Godwin, George C. Morris
Patented Case
View Patent ↗
Granted: Jul 27, 1982
Filed: Jul 24, 1979
Inventors
John D. Ellis
George Crichton
Millard C. Godwin
George C. Morris
Assignee (at issue)
Leathers Chemical Company, Limited
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.