Granted Patent
Utility
US 4,691,371 · App. 06/813,407
Receptacle having improved discharge spout
Inventor:
Norwin C. Derby
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Dec 26, 1985
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.