Granted Patent
Utility
US 4,420,762 · App. 06/344,381
Chart recorder
Inventor:
Wayne Andrews
Patented Case
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Granted: Dec 13, 1983
Filed: Feb 1, 1982
Inventor
Wayne Andrews
Assignee (at issue)
Techsonic Industries, 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.