Granted Patent
Utility
US 4,880,589 · App. 07/219,757
Process of making a non-oriented, surface-roughened film or sheet
Inventors:
Hiromi Shigemoto, Shunji Abe, Akio Yamamoto
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Jun 21, 1988
Inventors
Hiromi Shigemoto
Shunji Abe
Akio 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.