Granted Patent
Utility
US 6,162,159 · App. 09/139,306
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Inventors:
Calvin Duke Martini, Eugene A. Helmetsie
Patented Case
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Granted: Dec 19, 2000
Filed: Aug 24, 1998
Inventors
Calvin Duke Martini
Eugene A. Helmetsie
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.