The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1999
Filed:
Feb. 26, 1998
Applicant:
Inventors:
Matti Arpiainen, Helsinki, FI;
Magnus Backstrom, Helsingfors, FI;
Torsten Heideman, Grankulla, FI;
Tom Mattson, Helsingfors, FI;
Erkki Ranki, Helsinki, FI;
Assignee:
Kvaerner Masa-Yards Oy, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B63B / ;
U.S. Cl.
CPC ...
114 40 ; 114 41 ;
Abstract
A relatively wide vessel is assisted through an ice field by an icebreaker having a relatively narrow hull. The icebreaker includes two steerable propulsion mechanisms at the opposite ends respectively of the hull, and the propulsion mechanisms are used to propel the icebreaker through the ice field in a direction at a substantial angle to its keel line, thereby opening in one pass of the icebreaker a passage having a width substantially greater than the waterline width of the icebreaker.