Granted Patent
Utility
US 4,269,362 · App. 06/059,164
Method and apparatus for beating fibre slurries
Inventor:
Leif A. Berggren
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Jul 20, 1979
Inventor
Leif A. Berggren
Assignee (at issue)
Torsten Lennart Berggren
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.