Granted Patent
Utility
US 6,054,019 · App. 08/973,950
Impregnation of fiber material in two subsequent concurrent impregnation zones
Inventors:
Johan Engstrom, Olav Hoglund
Patented Case
View Patent ↗
Granted: Apr 25, 2000
Filed: Dec 4, 1997
Inventors
Johan Engstrom
Olav Hoglund
Assignee (at issue)
Kvaerner Pulping 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.