Granted Patent
Utility
US 5,649,725 · App. 08/544,137
Thread joint for tube
Inventors:
Shigeo Nagasaku, Kenichi Ohyabu, Jun Maeda, Akira Narita
Patented Case
View Patent ↗
Granted: Jul 22, 1997
Filed: Oct 17, 1995
Inventors
Shigeo Nagasaku
Kenichi Ohyabu
Jun Maeda
Akira Narita
Assignee (at issue)
SUMITOMO METAL INDUSTRIES, 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.