Granted Patent
Utility
US 4,853,200 · App. 07/171,199
Continuous process for preparing sodium orthophosphate slurries from natural soda ash orthophosphoric acid
Inventors:
N. Earl Stahlheber, John E. Lyon
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Mar 21, 1988
Inventors
N. Earl Stahlheber
John E. Lyon
Assignee (at issue)
Monsanto Company
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.