Granted Patent
Utility
US 4,961,844 · App. 07/332,020
Apparatus for separating a suspension of fibrous cellulose pulp
Inventors:
Rolf Ekholm, Rune Hillstrom, Daniel Pålsson
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Mar 28, 1989
Inventors
Rolf Ekholm
Rune Hillstrom
Daniel Pålsson
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.