Granted Patent
Utility
US 4,185,075 · App. 05/145,493
Phosphoric acid ammoniation apparatus with water quench
Inventors:
John D. Ellis, George Crichton, Millard C. Godwin, George C. Morris
Patented Case
View Patent ↗
Granted: Jan 22, 1980
Filed: May 20, 1971
Inventors
John D. Ellis
George Crichton
Millard C. Godwin
George C. Morris
Assignee (at issue)
Occidental Research and Engineering Ltd.
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.