Granted Patent
Utility
US 4,913,806 · App. 07/361,308
Apparatus for screening a suspension of fibrous cellulose pulp
Inventors:
Rune Hillstrom, Rolf Ekholm
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Jun 5, 1989
Inventors
Rune Hillstrom
Rolf Ekholm
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.