Granted Patent
Utility
US 6,745,842 · App. 09/971,308
Concentric casing jack
Inventors:
William James Hughes, Mark Dunbar
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Oct 4, 2001
Inventors
William James Hughes
Mark Dunbar
Assignee (at issue)
Sunstone 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.