Granted Patent
Utility
US 4,778,698 · App. 07/030,730
Innerseal for container for use with liquid contents
Inventor:
David T. Ou-Yang
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Mar 26, 1987
Inventor
David T. Ou-Yang
Assignee (at issue)
Minnesota Mining and Manufacturing 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.