Granted Patent
Utility
US 5,178,293 · App. 07/732,903
Easily-openable packaging container
Inventors:
Takanori Suzuki, Yukio Takata, Takeshi Shinohara
Patented Case
View Patent ↗
Granted: Jan 12, 1993
Filed: Aug 7, 1991
Inventors
Takanori Suzuki
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.