Granted Patent
Utility
US 5,167,339 · App. 07/713,497
Easily openable container and method of producing the same
Inventors:
Yukio Takata, Takeshi Shinohara
Patented Case
View Patent ↗
Granted: Dec 1, 1992
Filed: Jun 12, 1991
Inventors
Yukio Takata
Takeshi Shinohara
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.