Granted Patent
Utility
US 6,598,309 · App. 10/137,555
Bolt centralizer
Inventor:
Perry L. Coombs
Patented Case
View Patent ↗
Granted: Jul 29, 2003
Filed: Apr 30, 2002
Inventor
Perry L. Coombs
Assignee (at issue)
Oldenburg Cannon, Inc.
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.