Granted Patent
Utility
US 4,331,290 · App. 06/188,366
Multiple pocket, expandable envelope, and blank and method for forming same
Inventor:
Albert A. Benham
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Sep 18, 1980
Inventor
Albert A. Benham
Assignee (at issue)
Champion International Corporation Limited
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.