Granted Patent
Utility
US 4,427,489 · App. 06/276,008
Mixing device and method
Inventor:
Finn Jacobsen
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Jun 22, 1981
Inventor
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.