Granted Patent
Utility
US 5,323,914 · App. 07/778,814
Method of and apparatus for separating heavy impurities from fiber suspensions in connection with pumping
Inventors:
Kaj Henricson, Raimo Pitkanen, Pentti Vikio
Patented Case
View Patent ↗
Granted: Jun 28, 1994
Filed: Feb 6, 1992
Inventors
Kaj Henricson
Raimo Pitkanen
Pentti Vikio
Assignee (at issue)
A. Ahlstrom Corporation
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.