Granted Patent
Utility
US 5,190,093 · App. 07/806,322
Method for casting iron pipe
Inventor:
Gene L. Oliver
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Dec 13, 1991
Inventor
Gene L. Oliver
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.