US3745964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racing lower unit
Assignee: Outboard Marine Corp
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Filing: 1971-08-19
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Granted: 1973-07-17
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Expires: 1991-08-19
Abstract
Abstract Disclosed herein is a marine propulsion device comprising a lower unit including exhaust gas discharge means located in the lower unit for discharging gas, during forward travel, into the area in front of the upper half of the path of the blades of a propeller rotatably carried by the lower unit.
Inventors
- 👤 D Henrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:38
CPC Classifications
B; B63; B63H; B63H20/00; B63H20/24; B63H20/245
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A marine propulsion device comprising a lower unit including a propeller shaft, means rotatably supporting said propeller shaft on said lower unit, a transversely flat rearward surface at the rear of said lower unit above said propeller shaft, a propeller mounted on said shaft rearwardly of said flat surface and for common rotation with said shaft and having at least one propeller blade, and a bore terminating in a port in said flat surface at the rear of said lower unit and communicating with a source of gas to provide for discharge of gas, during forward travel, into the area in front of the upper half of the path of said propeller blade.
Claim 2
Dependent Claim
113 words
A marine propulsion device comprising a lower unit including a propeller shaft, means rotatably supporting said propeller shaft on said lower unit, a transversely flat rearward surface at the rear of said lower unit above said propeller shaft, a propeller mounted on said shaft rearwardly of said flat surface and for common rotation with said shaft and having at least one propeller blade, and a bore terminating in a port in said flat surface at the rear of said lower unit and communicating with a source of gas to provide for discharge of gas, during forward travel, into the area in front of the upper half of the path of said propeller blade.
Claim 3
Dependent Claim
20 words
A marine propulsion device in accordance with claim 1 and including a plurality of said bores in vertically spaced relation.
Claim 4
Dependent Claim
26 words
A marine propulsion device in accordance with claim 1 wherein said lower unit includes an exhaust gas passage system and said bore communicates with said system.
Claim 5
Dependent Claim
29 words
A marine propulsion device in accordance with claim 1 wherein said lower unit includes a cavitation plate and said transversely flat rearward surface is located below said cavitation plate.
Claim 6
Dependent Claim
89 words
A marine propulsion device including a lower unit including an exhaust gas passage system, a cavitation plate, and a transversely flat rearward surface below said cavitation plate, a propeller shaft, means rotatably supporting said propeller shaft in said lower unit below said surface, a propeller mounted on said shaft rearwardly of said surface and for common rotation with said shaft and having at least one propeller blade and a plurality of vertically spaced bores respectively terminating in ports at said surface and communicating with said exhaust gas passage system.
Claim 7
Dependent Claim
89 words
A marine propulsion device including a lower unit including an exhaust gas passage system, a cavitation plate, and a transversely flat rearward surface below said cavitation plate, a propeller shaft, means rotatably supporting said propeller shaft in said lower unit below said surface, a propeller mounted on said shaft rearwardly of said surface and for common rotation with said shaft and having at least one propeller blade and a plurality of vertically spaced bores respectively terminating in ports at said surface and communicating with said exhaust gas passage system.
Claim 8
Dependent Claim
88 words
A marine propulsion device comprising a lower unit including a cavitation plate, a propeller shaft, means rotatably supporting said propeller shaft on said lower unit below said cavitation plate, a propeller mounted on said shaft for common rotation therewith and having at least one propeller blade, and a bore extending in said lower unit, communicating with a source of gas and terminating in a port located at the rear of said lower unit in front of said propeller and below said cavitation plate and above said propeller shaft.
Claim 9
Dependent Claim
88 words
A marine propulsion device comprising a lower unit including a cavitation plate, a propeller shaft, means rotatably supporting said propeller shaft on said lower unit below said cavitation plate, a propeller mounted on said shaft for common rotation therewith and having at least one propeller blade, and a bore extending in said lower unit, communicating with a source of gas and terminating in a port located at the rear of said lower unit in front of said propeller and below said cavitation plate and above said propeller shaft.
Claim 10
Dependent Claim
35 words
A marine propulsioN device in accordance with claim 6 including a plurality of said bores located in vertically spaced relation between said cavitation plate and said propeller shaft at the rear of said lower unit.
Claim 11
Dependent Claim
26 words
A marine propulsion device in accordance with claim 7 wherein said lower unit includes an exhaust gas passage system and said bores communicate with said system.
Claim 12
Dependent Claim
84 words
A marine propulsion device comprising a lower unit including a propeller shaft, means rotatably supporting said propeller shaft on said lower unit, a propeller mounted on said shaft for common rotation therewith and having at least one propeller blade, and a plurality of bores extending in said lower unit and communicating with a source of gas and terminating in vertically spaced ports located at the rear of said lower unit and in front of the upper half of the path of said propeller blade.
Claim 13
Dependent Claim
84 words
A marine propulsion device comprising a lower unit including a propeller shaft, means rotatably supporting said propeller shaft on said lower unit, a propeller mounted on said shaft for common rotation therewith and having at least one propeller blade, and a plurality of bores extending in said lower unit and communicating with a source of gas and terminating in vertically spaced ports located at the rear of said lower unit and in front of the upper half of the path of said propeller blade.
Claim 14
Dependent Claim
26 words
A marine propulsion device in accordance with claim 9 wherein said lower unit includes an exhaust gas passage system and said bores communicate with said system.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |