Granted Patent
Utility
US 5,439,628 · App. 08/187,086
Method for manufacturing polypropylene film and sheet
Inventor:
Hwang-Wen Huang
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Jan 25, 1994
Inventor
Hwang-Wen Huang
Assignee (at issue)
INTEPLAST GROUP CORPORATION
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.