Granted Patent
Utility
US 5,334,272 · App. 07/915,669
Method for producing an easily openable container
Inventors:
Yukio Takata, Takeshi Shinohara
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Jul 21, 1992
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.