Granted Patent
Utility
US 5,975,158 · App. 09/131,749
Method for preventing bulge of liquid packaging
Inventors:
Robert L. Gordon, Xiang Yu
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: Aug 10, 1998
Inventors
Robert L. Gordon
Xiang Yu
Assignee (at issue)
INTERNATIONAL PAPER COMPANY
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.