Granted Patent
Utility
US 4,754,935 · App. 07/037,005
Method and apparatus for refining fibrous material
Inventor:
Johan Gullichsen
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: Apr 10, 1987
Inventor
Johan Gullichsen
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.