Granted Patent
Utility
US 4,237,618 · App. 06/022,910
Process for mechanically dewatering sewage sludge
Inventor:
Vere Maffet
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Mar 22, 1979
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.