Granted Patent
Utility
US 4,478,023 · App. 06/373,238
Universal four flap opener
Inventor:
Michael Becker
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Apr 29, 1982
Inventor
Michael Becker
Assignee (at issue)
Figgie Inernational 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.