Granted Patent
Utility
US 4,780,295 · App. 07/069,991
Process for purifying phosphoric acid
Inventors:
Jeffrey C. Dore, David P. Brochu, Richard E. Hall
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Jul 6, 1987
Inventors
Jeffrey C. Dore
David P. Brochu
Richard E. Hall
Assignee (at issue)
FMC CORPORATION
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.