Floating-type offshore structure

Patent 4457250 Issued on July 3, 1984. Estimated Expiration Date:

December 15, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3191201

3391666

3577946

3616773

3771481

Arctic caisson
Patent #: 4048943
Issued on: 09/20/1977
Inventor: Gerwick, Jr.

Method of deflecting ice at upright columns submerged in water of stationary or floating structures in marine areas in which the occurence of ice may be expected, and ice deflector assembly therefor
Patent #: 4063428
Issued on: 12/20/1977
Inventor: Waas

Method and apparatus for protecting offshore structures against forces from moving ice sheets
Patent #: 4102144
Issued on: 07/25/1978
Inventor: Anders

Semisubmerged ship Patent #: 4174671
Issued on: 11/20/1979
Inventor: Seidl

Inventors

Assignee

Mitsui Engineering & Shipbuilding Co., Ltd.

Application

No. 06/330820 filed on 12/15/1981

US Classes:

114/265, Multiple leg114/293ANCHORING ARRANGEMENT

Examiners

Primary: Blix, Trygve M.
Assistant: Sotelo, Jesus D.

Attorney, Agent or Firm

Armstrong, Nikaido, Marmelstein & Kubovcik

International Classes

B63B 35/44 (20060101)
B63B 35/00 (20060101)
B63B 35/08 (20060101)

Foreign Application Priority Data

1981-05-21 JP

Abstract

A floating-type offshore structure, of which the main body comprises a lower hull and plurality of struts mounted on the struts and supporting a platform above the sea level and is moored through mooring wire ropes or chains at a predetermined offshore location, and which is adapted for use under both of an ice-covered and an iceless conditions of the sea by adjusting the amount of ballast water contained in a ballast tank or tanks formed in the lower hull and/or the struts and adapted for causing ice floes to undergo downward flexural failure on account of bending stresses when they move into the sea water along the ice contacting face of the strut which is inclined inwardly toward below.