Granted Patent
Utility
US 5,215,604 · App. 07/561,047
Long-wear packerhead segment
Inventor:
Gerald R. Crawford
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Aug 1, 1990
Inventor
Gerald R. Crawford
Assignee (at issue)
International Pipe Machinery Corporation
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.