Granted Patent
Utility
US 6,148,924 · App. 09/189,961
Method and apparatus for the disassembly of drill pipe
Inventor:
William C. Shafer
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Nov 10, 1998
Inventor
William C. Shafer
Assignee (at issue)
Oil & Gas Rental Services, 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.