Granted Patent
Utility
US 4,379,009 · App. 06/284,254
Sealing method using heat-shrinkable film
Inventors:
Takaaki Shibata, Tetsuhiro Yamamoto
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Jul 17, 1981
Inventors
Takaaki Shibata
Tetsuhiro Yamamoto
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.