Granted Patent
Utility
US 6,378,630 · App. 09/458,604
Locking swivel device
Inventors:
Leonardo Ritorto, Robert Roszak
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Dec 10, 1999
Inventors
Leonardo Ritorto
Robert Roszak
Assignee (at issue)
Canadian Downhole Drill Systems
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.