Granted Patent
Utility
US 6,742,596 · App. 09/860,127
Apparatus and methods for tubular makeup interlock
Inventor:
David M. Haugen
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: May 17, 2001
Inventor
David M. Haugen
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.