Granted Patent
Utility
US 5,140,053 · App. 07/481,631
Foamable polymer composition and foamed article
Inventors:
Yohzoh Yamamoto, Takasi Nakagawa
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Feb 20, 1990
Inventors
Yohzoh Yamamoto
Takasi Nakagawa
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.