Granted Patent
Utility
US 4,511,463 · App. 05/965,394
Process for recovery of phosphate ore
Inventors:
Edward N. Alexander, Richard Neil Smith
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Dec 1, 1978
Inventors
Edward N. Alexander
Richard Neil Smith
Assignee (at issue)
West Point Pepperell
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.