Granted Patent
Utility
US 5,403,442 · App. 08/159,047
Method of deaerating and pumping a fiber suspension prior to washing
Inventors:
Kaj Henricson, Raimo Pitkanen
Patented Case
View Patent ↗
Granted: Apr 4, 1995
Filed: Nov 29, 1993
Inventors
Kaj Henricson
Raimo Pitkanen
Assignee (at issue)
A. Ahlstrom A Corporation of Finland
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.