Granted Patent
Utility
US 5,081,888 · App. 07/441,813
Apparatus for connecting and disconnecting threaded members
Inventor:
Joerg E. Schulze-Beckinghausen
Patented Case
View Patent ↗
Granted: Jan 21, 1992
Filed: Nov 27, 1989
Inventor
Joerg E. Schulze-Beckinghausen
Assignee (at issue)
Weatherford Holding U.S., 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.