Granted Patent
Utility
US 6,237,967 · App. 09/325,357
Threaded connection for oil country tubular goods and its method of manufacturing
Inventors:
Miyuki Yamamoto, Masaaki Sugino
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Jun 4, 1999
Inventors
Miyuki Yamamoto
Masaaki Sugino
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.