Granted Patent
Utility
US 4,877,393 · App. 07/277,815
Apparatus for producing biaxially oriented polymer sheet
Inventor:
Ying-Cheng Lo
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Nov 30, 1988
Inventor
Ying-Cheng Lo
Assignee (at issue)
Aluminum Company of America
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.