Granted Patent
Utility
US 4,791,997 · App. 07/142,105
Pipe handling apparatus and method
Inventor:
Igor Krasnov
Patented Case
View Patent ↗
Granted: Dec 20, 1988
Filed: Jan 7, 1988
Inventor
Igor Krasnov
Assignee (at issue)
Vetco Gray, 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.