Patent US3635186A successfully refreshed from Google Patents.
US3635186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ship construction
Assignee: Individual
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Filing: 1970-02-25
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Granted: 1972-01-18
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Expires: 1990-02-25
Abstract
Abstract A hull designed to afford additional protection to the ship''s screw or screws and rudder or rudders against damage by floating or sheet ice, the hull having a flat bottom midship section and a buttock flow stern section. A closed annular nozzle closely and coaxially surrounds each screw and a skeg projects downwardly on each side of the hull, each skeg being a forwardly extending streamline continuation of an outboard rim of a nozzle.
Inventors
- 👤 William H German
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/02; B63B1/04; B63B1/08; B63H; B63H5/00; B63H5/07; B63H5/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A ship comprising a. a hull having an essentially flat bottom midship section and a buttock flow stern section sloping gradually upwardly and rearwardly from such midship section, b. at least one screw and shaft connected thereto, c. a closed annular nozzle secured to said stern section of the hull closely and coaxially surrounding each said screw, d. and a skeg projecting downwardly from said stern section on each side of the hull, said skeg forming a forwardly extending streamline continuation of an outboard rim of a said nozzle.
Claim 2
Dependent Claim
89 words
A ship comprising a. a hull having an essentially flat bottom midship section and a buttock flow stern section sloping gradually upwardly and rearwardly from such midship section, b. at least one screw and shaft connected thereto, c. a closed annular nozzle secured to said stern section of the hull closely and coaxially surrounding each said screw, d. and a skeg projecting downwardly from said stern section on each side of the hull, said skeg forming a forwardly extending streamline continuation of an outboard rim of a said nozzle.
Claim 3
Dependent Claim
39 words
A ship according to claim 1, wherein at least the portion of the lower edge of each skeg adjacent a nozzle rim projects to a depth below the centerline of the shaft of the screw located in such nozzle.
Claim 4
Dependent Claim
17 words
A ship according to claim 1, wherein said skegs diverge from each other in the forward direction.
Claim 5
Dependent Claim
32 words
A ship according to claim 3, wherein said skegs diverge from each other throughout their entire length extending from a said nozzle to a location at which they merge into the hull.
Claim 6
Dependent Claim
22 words
A ship according to claim 4, wherein said location is situated in the buttock flow stern section rearward of the midship section.
Claim 7
Dependent Claim
51 words
A single-screw ship according to claim 1, wherein the two skegs form continuations of opposite rims of a single nozzle surrounding a single screw and located on the centerline of the ship, said skegs continuously diverging from each other in the forward direction to merge into the buttock flow stern section.
Claim 8
Dependent Claim
28 words
A ship according to claim 6, wherein the lower edge of each skeg projects to a depth below the lower edge of the shaft connected to said screw.
Claim 9
Dependent Claim
43 words
A ship according to claim 6, including a pair of rudders located rearwardly beyond said nozzle, each rudder being displaced to a respective side of the centerline of the screw within said nozzle while remaining within the slip-stream propelled rearwardly by said screw.
Claim 10
Dependent Claim
18 words
A ship according to claim 8, including an ice knife secured to the hull above each said rudder.
Claim 11
Dependent Claim
48 words
A twin-screw ship according to claim 1, wherein the two skegs form continuations of the outboard rims of a pair of said nozzles, each of which surrounds a screw, said skegs continuously diverging from each other in the forward direction to merge into the buttock flow stern section.
Claim 12
Dependent Claim
46 words
A ship according to claim 10, including a rudder located rearwardly beyond each said nozzle, each said rudder being displaced slightly inwardly of the centerline of the screw located within the associated nozzle while remaining within the slip-stream propelled rearwardly by the screw within such nozzle.
Claim 13
Dependent Claim
18 words
A ship according to cLaim 11, including an ice knife secured to the hull above each such rudder.
References Cited (Backward Citations)
US3138130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |