Granted Patent
Utility
US 4,776,243 · App. 06/801,718
Hydraulic safety interlock system
Inventors:
Jorg Schulze-Beckinghausen, Hans-Christian Bock
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Nov 26, 1985
Inventors
Jorg Schulze-Beckinghausen
Hans-Christian Bock
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.