Granted Patent
Utility
US 4,768,411 · App. 06/928,772
Easy-open bag and apparatus and method for making same
Inventor:
Philip P. Su
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Nov 7, 1986
Inventor
Philip P. Su
Assignee (at issue)
W. R. Grace & Co., Cryovac Div.
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.