Granted Patent
Utility
US 5,672,658 · App. 08/516,089
Highly stiff propylene-ethylene block copolymer composition and a process for producing the same
Inventors:
Takahiro Oka, Shunji Kawazoe, Yasuhiro Yamane
Patented Case
View Patent ↗
Granted: Sep 30, 1997
Filed: Aug 17, 1995
Inventors
Takahiro Oka
Shunji Kawazoe
Yasuhiro Yamane
Assignee (at issue)
Chisso 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.