Granted Patent
Utility
US 5,755,289 · App. 08/640,458
Drilling rig elevator with replaceable clamping inserts and method for installation
Inventors:
Per Angman, Jens Lutzhöft, Hans-Jurgen Ulbrich
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: May 1, 1996
Inventors
Per Angman
Jens Lutzhöft
Hans-Jurgen Ulbrich
Assignee (at issue)
TESCOM CORPORATION
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.