Granted Patent
Utility
US 6,053,255 · App. 09/103,209
Blowout preventer lift apparatus and method
Inventor:
Jack Crain
Patented Case
View Patent ↗
Granted: Apr 25, 2000
Filed: Jun 23, 1998
Inventor
Jack Crain
Assignee (at issue)
Jack Crain
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.