Granted Patent
Utility
US 6,487,518 · App. 09/598,050
Thickness reducing management system for pipes in pipe lines
Inventors:
Katsumasa Miyazaki, Satoru Aoike, Satoshi Kanno, Masakazu Hisatsune
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Jun 21, 2000
Inventors
Katsumasa Miyazaki
Satoru Aoike
Satoshi Kanno
Masakazu Hisatsune
Assignee (at issue)
HITACHI, 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.