US3690281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stern construction for icebreaking vessels
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-12-21
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Granted: 1972-09-12
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Expires: 1990-12-21
Abstract
Abstract A construction for the stern of an icebreaking vessel wherein the stern is constructed and arranged to have a shape such that the vessel as it backs into its own broken channel filled with previously broken ice, effectively will shovel the ice pieces up and to the sides of the vessel, thereby clearing the channel so as to facilitate backing and simultaneously keep the ice away from the vessel''s screw(s).
Inventors
- 👤 William O Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:34
CPC Classifications
B; B63; B63B; B63B35/00; B63B35/08; B63B1/00; B63B1/02; B63B1/04; B63B1/08; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
An icebreaking ship having a main deck, a load waterline WL, and a hull including a stern portion of symmetrical shape about the longitudinal center-line of said ship, said stern portion having lateral and rear sides of substantially concave-like configuration, said sides terminating in a common plane disposed parallel to and located vertically below said main deck, said sides constructed and arranged to slope downward and outward from said deck and terminating outboard of said stern at a predetermined distance below said load waterline WL, whereby said ship, when backing in its own broken channel filled with previously broken ice, is adapted to shovel the ice pieces up and dispose them laterally of the sides of the ship.
Claim 2
Dependent Claim
118 words
An icebreaking ship having a main deck, a load waterline WL, and a hull including a stern portion of symmetrical shape about the longitudinal center-line of said ship, said stern portion having lateral and rear sides of substantially concave-like configuration, said sides terminating in a common plane disposed parallel to and located vertically below said main deck, said sides constructed and arranged to slope downward and outward from said deck and terminating outboard of said stern at a predetermined distance below said load waterline WL, whereby said ship, when backing in its own broken channel filled with previously broken ice, is adapted to shovel the ice pieces up and dispose them laterally of the sides of the ship.
Claim 3
Dependent Claim
25 words
A hull construction according claim 1 wherein said stern sides extend longitudinally between a Station 8 1/2 and the rearward most point of said ship.
Claim 4
Dependent Claim
26 words
A hull construction according to claim 1 wherein the slope of said sides decreases as said side approach their termination point below said load waterline WL.
Claim 5
Dependent Claim
46 words
A hull construction according to claim 1 wherein said stern sides extend longitudinally between a Station 8 1/2 and the rearward most point of said ship and extend laterally outward of said ship terminating at a waterline substantially 60 to 80 per cent of loaded draft.
Claim 6
Dependent Claim
30 words
A hull construction according to claim 1 wherein said sides terminate in a substantially continuous curvature as seen in horizontal section at the waterline defining the termination of said sides.
Claim 7
Dependent Claim
63 words
A hull construction according to claim 1 wherein said stern portion is constructed and arranged to protect any propellers and rudders associated with said ship from damage when said ship is proceeding in the aft direction, as well as from any ice that may be present at the sides of the broken channel in which said ship is preceeding in a forward direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |