Granted Patent
Utility
US 6,237,844 · App. 09/548,831
Inside bangtail envelope
Inventor:
Douglas Purcell
Patented Case
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Granted: May 29, 2001
Filed: Apr 13, 2000
Inventor
Douglas Purcell
Assignee (at issue)
Westvaco Corporation
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.