Granted Patent
Utility
US 4,715,846 · App. 06/872,797
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Inventor:
Chet Zak
Patented Case
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Granted: Dec 29, 1987
Filed: Jun 11, 1986
Inventor
Chet Zak
Assignee (at issue)
Post Machinery, Inc.
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.