Granted Patent
Utility
US 6,250,340 · App. 09/375,586
Alloy pipes and methods of making same
Inventors:
John Jones, Michael J. Yardley, Terry K Barker
Patented Case
View Patent ↗
Granted: Jun 26, 2001
Filed: Aug 17, 1999
Inventors
John Jones
Michael J. Yardley
Terry K Barker
Assignee (at issue)
Doncasters PLC
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.