Granted Patent
Utility
US 5,639,137 · App. 08/446,763
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Inventor:
Martinus C. M. Bakx
Patented Case
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Granted: Jun 17, 1997
Filed: Jun 2, 1995
Inventor
Martinus C. M. Bakx
Assignee (at issue)
The Mead 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.