Granted Patent
Utility
US 5,084,261 · App. 07/369,893
Recovery and utilization of gypstack leachate in hemihydrate phosphoric acid process
Inventor:
Michael B. Caesar
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Jun 22, 1989
Inventor
Michael B. Caesar
Assignee (at issue)
Occidental Chemical 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.