Granted Patent
Utility
US 4,244,287 · App. 06/055,569
Two-stage mechanical dewatering of sewage sludge
Inventor:
Vere Maffet
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Jul 9, 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.