Granted Patent
Utility
US 5,749,255 · App. 08/761,829
Bending device for hollow double-structured pipe
Inventor:
Saburo Arai
Patented Case
View Patent ↗
Granted: May 12, 1998
Filed: Dec 6, 1996
Inventor
Saburo Arai
Assignees (at issue)
Sankei Giken Kogyo Kabushiki Kaisya
Kabushiki Kaisya Vista
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.