Granted Patent
Utility
US 4,307,900 · App. 06/094,737
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Inventor:
Richard G. Krautsack
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Nov 19, 1979
Inventor
Richard G. Krautsack
Assignee (at issue)
MARKETON 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.