Granted Patent
Utility
US 4,981,009 · App. 07/176,827
Bag opening device
Inventor:
Gian C. Gianelli
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: Apr 4, 1988
Inventor
Gian C. Gianelli
Assignee (at issue)
W.R. Grace & Co. Conn.
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.