Granted Patent
Utility
US 5,056,571 · App. 07/662,020
Container fill system
Inventor:
Norwin C. Derby
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Feb 28, 1991
Inventor
Norwin C. Derby
Assignee (at issue)
Super Sack Mfg. Corp.
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.