Granted Patent
Utility
US 5,158,827 · App. 07/748,446
Matt film with a rough surface
Inventors:
Mikio Katagiri, Tatsuo Kato
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Aug 22, 1991
Inventors
Mikio Katagiri
Tatsuo Kato
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.