Granted Patent
Utility
US 4,900,612 · App. 07/000,898
Laminated structure
Inventors:
Koichiro Sato, Mikio Nakagawa, Kuniaki Kanemoto, Akito Nishimura
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Jan 6, 1987
Inventors
Koichiro Sato
Mikio Nakagawa
Kuniaki Kanemoto
Akito Nishimura
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.