Granted Patent
Utility
US 4,820,557 · App. 07/098,426
Thermoplastic packaging film of low I.sub.10 /I.sub.2
Inventor:
Thomas C. Warren
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Sep 17, 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.