Granted Patent
Utility
US 4,881,286 · App. 07/237,407
Effective diffuser/thickener screen backflushing
Inventors:
Johan C. F. C. Richter, Ole J. Ricter, Finn Jacobsen
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Aug 29, 1988
Inventors
Johan C. F. C. Richter
Ole J. Ricter
Finn Jacobsen
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.