Granted Patent
Utility
US 5,167,900 · App. 07/770,938
Method of producing an easily openable multilayer plastic container
Inventors:
Hiroshi Odaka, Hiroshi Maeda, Hiroyuki Takahashi, Toyokazu Yamada
Patented Case
View Patent ↗
Granted: Dec 1, 1992
Filed: Oct 4, 1991
Inventors
Hiroshi Odaka
Hiroshi Maeda
Hiroyuki Takahashi
Toyokazu Yamada
Assignee (at issue)
Idemitsu Petrochemical 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.