Granted Patent
Utility
US 6,726,022 · App. 10/182,487
Screening device and rotor for use in a screening device
Inventor:
Tomas Wikström
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Jul 30, 2002
Inventor
Tomas Wikström
Assignee (at issue)
Valmet Fibertech AB
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.