Granted Patent
Utility
US 5,040,899 · App. 07/521,318
Mixer
Inventor:
Olavi Koskinen
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: May 9, 1990
Inventor
Olavi Koskinen
Assignee (at issue)
A. Ahlstrom Corporation
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.