Granted Patent
Utility
US 5,012,972 · App. 07/428,091
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Inventors:
Duane M. Nordstrom, Harold L. Baker
Patented Case
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Granted: May 7, 1991
Filed: Oct 27, 1989
Inventors
Duane M. Nordstrom
Harold L. Baker
Assignee (at issue)
Longview Fibre Company
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.