Granted Patent
Utility
US 5,304,606 · App. 08/031,491
Thermoplastic resin composition
Inventor:
Yohzoh Yamamoto
Patented Case
View Patent ↗
Granted: Apr 19, 1994
Filed: Mar 15, 1993
Inventor
Yohzoh Yamamoto
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.