Granted Patent
Utility
US 5,200,439 · App. 07/679,533
Method for increasing intrinsic viscosity of syndiotactic polypropylene
Inventor:
Tadashi Asanuma
Patented Case
View Patent ↗
Granted: Apr 6, 1993
Filed: Apr 2, 1991
Inventor
Tadashi Asanuma
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.