Granted Patent
Utility
US 4,380,496 · App. 06/152,944
Mechanical dewatering process utilizing a nonuniform screw conveyor
Inventor:
Vere Maffet
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: May 23, 1980
Inventor
Vere Maffet
Assignee (at issue)
UOP LLC
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.