Granted Patent
Utility
US 5,597,428 · App. 08/454,408
Method of sealing containers
Inventors:
Tadahiro Matsumoto, Hiroyuki Takahashi, Kouzaburo Matsuzawa
Patented Case
View Patent ↗
Granted: Jan 28, 1997
Filed: May 30, 1995
Inventors
Tadahiro Matsumoto
Hiroyuki Takahashi
Kouzaburo Matsuzawa
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.