Patent US3640642A successfully refreshed from Google Patents.
US3640642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine flow through propeller
Assignee: Michigan Wheel Corp
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Filing: 1971-01-15
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Granted: 1972-02-08
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Expires: 1991-01-15
Abstract
Abstract A flow through marine propeller unit with exhaust creepage barrier structure at the rear of the hub formed of an middle unit. protrusion projecting radially outwardly to define a forwardly oriented dead end pocket.
Inventors
- 👤 Robert F Kress
- 👤 Eldon L Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:08
CPC Classifications
B; B63; B63H; B63H20/00; B63H20/24; B63H20/245
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A marine propeller unit having a hollow hub with a forward end and a rearward end through which exhaust gases are discharged rearwardly of the hub, and propeller blades extending radially outwardly from said hub, said hollow hub having a portion extending rearwardly of the propeller blades, an annular protrusion projecting radially outwardly from the outer periphery of said rearwardly extending hub portion, said protrusion having an annular forward face and an annular peripheral shearing edge, the improvement comprising: said protrusion being configurated to form forwardly oriented, dead end pocket means at the periphery of said hub portion, with said forward face forming part of said pocket means.
Claim 2
Dependent Claim
108 words
A marine propeller unit having a hollow hub with a forward end and a rearward end through which exhaust gases are discharged rearwardly of the hub, and propeller blades extending radially outwardly from said hub, said hollow hub having a portion extending rearwardly of the propeller blades, an annular protrusion projecting radially outwardly from the outer periphery of said rearwardly extending hub portion, said protrusion having an annular forward face and an annular peripheral shearing edge, the improvement comprising: said protrusion being configurated to form forwardly oriented, dead end pocket means at the periphery of said hub portion, with said forward face forming part of said pocket means.
Claim 3
Dependent Claim
14 words
The marine propeller unit in claim 1 wherein said forward face has curvilinear portions.
Claim 4
Dependent Claim
25 words
The marine propeller unit in claim 1 wherein said forward face includes at least portions at the innermost zone of said dead end pocket means.
Claim 5
Dependent Claim
102 words
A marine propeller unit having a hollow hub with a forward end and a rearward end through which exhaust gases are discharged rearwardly of the hub, and propeller blades extending radially outwardly from said hub, said hollow hub having a portion extendinG rearwardly of the propeller blades, an annular protrusion projecting radially outwardly from the outer periphery of said rearwardly extending hub portion, said protrusion having an annular forward face, the improvement comprising: said protrusion being configurated to form forwardly oriented, dead end pocket means at the periphery of said hub portion, with said forward face forming part of said pocket means.
Claim 6
Dependent Claim
102 words
A marine propeller unit having a hollow hub with a forward end and a rearward end through which exhaust gases are discharged rearwardly of the hub, and propeller blades extending radially outwardly from said hub, said hollow hub having a portion extendinG rearwardly of the propeller blades, an annular protrusion projecting radially outwardly from the outer periphery of said rearwardly extending hub portion, said protrusion having an annular forward face, the improvement comprising: said protrusion being configurated to form forwardly oriented, dead end pocket means at the periphery of said hub portion, with said forward face forming part of said pocket means.
Claim 7
Dependent Claim
14 words
The marine propeller unit in claim 4 wherein said forward face has curvilinear portions.
Claim 8
Dependent Claim
25 words
The marine propeller unit in claim 4 wherein said forward face includes at least portions at the innermost zone of said dead end pocket means.
Claim 9
Dependent Claim
85 words
A marine propeller unit having a hollow hub with a forward end and a rearward end through which exhaust gases are discharged rearwardly of the hub, and propeller blades extending radially outwardly from said hub, said hollow hub having a portion extending rearwardly of the propeller blades, an annular protrusion projecting radially outwardly from the outer periphery of said rearwardly extending hub portion, the improvement comprising: said protrusion being configurated to form forwardly oriented, dead end pocket means at the periphery of said hub portion.
Claim 10
Dependent Claim
85 words
A marine propeller unit having a hollow hub with a forward end and a rearward end through which exhaust gases are discharged rearwardly of the hub, and propeller blades extending radially outwardly from said hub, said hollow hub having a portion extending rearwardly of the propeller blades, an annular protrusion projecting radially outwardly from the outer periphery of said rearwardly extending hub portion, the improvement comprising: said protrusion being configurated to form forwardly oriented, dead end pocket means at the periphery of said hub portion.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |