Granted Patent
Utility
US 4,279,957 · App. 06/071,067
Laminated film or sheet structure and process for production thereof
Inventors:
Takayuki Hiraoka, Kenji Fujiyoshi
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Aug 30, 1979
Inventors
Takayuki Hiraoka
Kenji Fujiyoshi
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.