Granted Patent
Utility
US 4,968,417 · App. 07/357,289
Apparatus for screening a suspension of fibrous cellulose pulp
Inventor:
Bjorn Ahs
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: May 26, 1989
Inventor
Bjorn Ahs
Assignee (at issue)
Kamyr 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.