Granted Patent
Utility
US 4,973,375 · App. 07/399,391
Process for producing a composite sheet
Inventors:
Kozo Itaya, Hirotaka Nishida, Kazutoshi Fukuda
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Aug 25, 1989
Inventors
Kozo Itaya
Hirotaka Nishida
Kazutoshi Fukuda
Assignees (at issue)
Mitsui Petrochemical Industries, Ltd.
SHIONOGI & CO., LTD.
TAISEI KAKO CO., 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.