Granted Patent
Utility
US 6,138,834 · App. 09/227,523
Recovery apparatus for drilling and excavation application and related methods
Inventor:
Ricky Southall
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Jan 8, 1999
Inventor
Ricky Southall
Assignee (at issue)
SUN DRILLING 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.