Granted Patent
Utility
US 5,069,752 · App. 07/516,519
Digester screen switching
Inventor:
Johan C. F. C. Richter
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Apr 30, 1990
Inventor
Johan C. F. C. Richter
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.