Granted Patent
Utility
US 5,894,895 · App. 08/755,186
Heave compensator for drill ships
Inventor:
Walter Thomas Welsh
Patented Case
View Patent ↗
Granted: Apr 20, 1999
Filed: Nov 25, 1996
Inventor
Walter Thomas Welsh
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.