Granted Patent
Utility
US 3,987,893 · App. 05/651,543
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Inventor:
Wallace E. Hanson
Patented Case
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Granted: Oct 26, 1976
Filed: Jan 22, 1976
Inventor
Wallace E. Hanson
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.