Granted Patent
Utility
US 4,303,234 · App. 06/093,962
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Inventor:
Dale Plum
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Nov 14, 1979
Inventor
Dale Plum
Assignee (at issue)
Bell and Howell, LLC
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.