Granted Patent
Utility
US 4,837,084 · App. 07/068,997
Thermoplastic multi-layer packaging film and bags made therefrom
Inventor:
Thomas C. Warren
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jul 2, 1987
Inventor
Thomas C. Warren
Assignee (at issue)
W.R. Grace & Co. Conn.
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.