Granted Patent
Utility
US 4,327,189 · App. 06/156,703
Reversible deflocculation of clay slurries
Inventor:
Marvin M. Crutchfield
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Jun 5, 1980
Inventor
Marvin M. Crutchfield
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.