Granted Patent
Utility
US 6,223,977 · App. 09/324,594
Easy open envelope
Inventor:
Maurice Hill
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Jun 3, 1999
Inventor
Maurice Hill
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.