Granted Patent
Utility
US 5,516,397 · App. 08/003,808
Polypropylene-laminated steel sheet and production thereof
Inventors:
Koujiro Takano, Mamoru Ishii, Masaharu Mito, Satoshi Akiyama
Patented Case
View Patent ↗
Granted: May 14, 1996
Filed: Jan 13, 1993
Inventors
Koujiro Takano
Mamoru Ishii
Masaharu Mito
Satoshi Akiyama
Assignees (at issue)
NIPPON STEEL CORPORATION
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.