Granted Patent
Utility
US 6,490,900 · App. 09/685,887
Pipe gauging and rounding apparatus and method
Inventors:
Gene L. Oliver, John R. Washington
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Oct 11, 2000
Inventors
Gene L. Oliver
John R. Washington
Assignee (at issue)
AMERICAN Cast Iron Pipe Company
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.