Granted Patent
Utility
US 4,277,448 · App. 05/909,899
Phosphoric acid process with high circulation rates
Inventors:
Fernando Ore, John D. Ellis, James H. Moore
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: May 26, 1978
Inventors
Fernando Ore
John D. Ellis
James H. Moore
Assignee (at issue)
Occidental Petroleum
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.