Granted Patent
Utility
US 5,997,740 · App. 08/908,237
Lifting mechanism assembly for a rotary drive assembly
Inventors:
Robert D. Cook, John Thorum, Leonard J. A. Wood
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Aug 7, 1997
Inventors
Robert D. Cook
John Thorum
Leonard J. A. Wood
Assignee (at issue)
Baker Hughes Holdings LLC
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.