Granted Patent
Utility
US 4,743,320 · App. 06/795,227
Method of heat sealing a thermoplastic drum and lid and article of manufacture
Inventor:
Mark D. Shaw
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Nov 5, 1985
Inventor
Mark D. Shaw
Assignee (at issue)
Bondico, Inc.
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.