Granted Patent
Utility
US 4,643,943 · App. 06/694,362
Multi-layer polyolefin shrink film
Inventor:
Julian H. Schoenberg
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Jan 24, 1985
Inventor
Julian H. Schoenberg
Assignee (at issue)
W. R. Grace & Co., Cryovac Div.
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.