Granted Patent
Utility
US 4,388,993 · App. 06/228,114
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Inventor:
John J. Lavery
Patented Case
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Granted: Jun 21, 1983
Filed: Jan 26, 1981
Inventor
John J. Lavery
Assignee (at issue)
Champion International Corporation Limited
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.