Granted Patent
Utility
US 6,013,018 · App. 09/010,861
Sonic valve closure assembly for valve bags
Inventor:
Roger Bannister
Patented Case
View Patent ↗
Granted: Jan 11, 2000
Filed: Jan 22, 1998
Inventor
Roger Bannister
Assignee (at issue)
Bemis Associates, 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.