Granted Patent
Utility
US 6,725,938 · App. 09/868,790
Apparatus and method for facilitating the connection of tubulars using a top drive
Inventor:
Bernd-Georg Pietras
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Sep 4, 2001
Inventor
Bernd-Georg Pietras
Assignee (at issue)
Weatherford/Lamb, 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.