Granted Patent
Utility
US 5,891,940 · App. 08/979,844
Syndiotactic polypropylene resin composition
Inventors:
Pingfan Chen, Ichiro Fujio
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: Nov 26, 1997
Inventors
Pingfan Chen
Ichiro Fujio
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.