Granted Patent
Utility
US 4,284,614 · App. 06/145,641
Process for production of high purity phosphoric acid from high alumina phosphate pebble rock
Inventor:
Fernando Ore
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: May 1, 1980
Inventor
Fernando Ore
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.