Granted Patent
Utility
US 4,804,912 · App. 07/049,549
Apparatus for electromagnetically measuring the distance between two opposing grinding surfaces
Inventor:
Claes G. Lysen
Patented Case
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Granted: Feb 14, 1989
Filed: May 14, 1987
Inventor
Claes G. Lysen
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.