Granted Patent
Utility
US 5,218,917 · App. 07/851,085
Icebreaking ship
Inventors:
Arjo Harjula, Pekka Salmi
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Mar 13, 1992
Inventors
Arjo Harjula
Pekka Salmi
Assignee (at issue)
Kvaerner Masa-Yards Oy
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.