Patent US5366397A successfully refreshed from Google Patents.
US5366397A
Expired / Lapsed
US
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Water jet propulsion unit
Assignee: Yamaha Marine Co Ltd
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Filing: 1993-04-14
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Granted: 1994-11-22
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Expires: 2013-04-14
Abstract
Abstract A water jet propulsion unit in which water is drawn off of the jet propulsion unit through a tap for other purposes, such as pumping the bilge with a jet pump or delivering coolant to the engine. A filter element which can be easily serviced is positioned in the conduit for precluding small particles which could clog the conduit from entering the conduit.
Inventors
- 👤 Noboru Suganuma
- 👤 Shigeyuki Ozawa
- 👤 Ryoichi Nakase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:33
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/04; B63B; B63B13/00; B63B13/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
A jet propulsion unit for a watercraft, said jet propulsion unit being comprising a water inlet section through which water may be drawn from the body of water in which the watercraft is operating, an impeller section containing an impeller for pumping water, a discharge nozzle through which the water pumped by the impeller is discharged, and a water outlet tap from which a portion of the water pumped by said impeller may be discharged, a conduit having an inlet end detachably connected to said jet propulsion unit water outlet tap for receiving water pumped by said impeller and for circulating at least a portion of the water pumped by said impeller to another location, and a filter in said inlet end of said conduit for preventing foreign particles from entering said conduit.
Claim 2
Dependent Claim
133 words
A jet propulsion unit for a watercraft, said jet propulsion unit being comprising a water inlet section through which water may be drawn from the body of water in which the watercraft is operating, an impeller section containing an impeller for pumping water, a discharge nozzle through which the water pumped by the impeller is discharged, and a water outlet tap from which a portion of the water pumped by said impeller may be discharged, a conduit having an inlet end detachably connected to said jet propulsion unit water outlet tap for receiving water pumped by said impeller and for circulating at least a portion of the water pumped by said impeller to another location, and a filter in said inlet end of said conduit for preventing foreign particles from entering said conduit.
Claim 3
Dependent Claim
20 words
A jet propulsion unit as set forth in claim 1 wherein the filter element is provided in the water tap.
Claim 4
Dependent Claim
35 words
A jet propulsion unit as set forth in claim 1 wherein the the other end of the conduit cooperates with a jet pump having a venturi section for pumping the bilge of the associated watercraft.
Claim 5
Dependent Claim
20 words
A jet propulsion unit as set forth in claim 3 wherein the filter element is provided in the water tap.
Claim 6
Dependent Claim
49 words
A jet propulsion unit as set forth in claim 1 wherein the filter element is comprised of an S-shaped section adapted to be inserted into the water outlet tap and having a pair of tab ends adapted to be snapped into locking engagement with the end of the conduit.
Claim 7
Dependent Claim
51 words
A jet propulsion unit as set forth in claim 5 further including a pair of resilient legs extending from the curved sections of the S-shaped portion and having tabs at their opposite ends adapted to engage another portion of the water outlet tap for locking the filter element in the conduit.
Claim 8
Dependent Claim
126 words
A jet propulsion unit for a watercraft comprising a water inlet section through which water may be drawn for the body of water in which the watercraft is operating, an impeller section containing an impeller for pumping water, and a discharge nozzle through which the water pumped by the impeller is discharged, a conduit connected to said jet propulsion unit for circulating at least a portion of the water pumped by said impeller to another location, and a filter in said conduit for preventing foreign particles from entering said conduit, said filter element being comprises of an S-shaped section adapted to be inserted into said conduit and having a pair of tab ends adapted to be snapped into locking engagement with the end of said conduit.
Claim 9
Dependent Claim
126 words
A jet propulsion unit for a watercraft comprising a water inlet section through which water may be drawn for the body of water in which the watercraft is operating, an impeller section containing an impeller for pumping water, and a discharge nozzle through which the water pumped by the impeller is discharged, a conduit connected to said jet propulsion unit for circulating at least a portion of the water pumped by said impeller to another location, and a filter in said conduit for preventing foreign particles from entering said conduit, said filter element being comprises of an S-shaped section adapted to be inserted into said conduit and having a pair of tab ends adapted to be snapped into locking engagement with the end of said conduit.
Claim 10
Dependent Claim
51 words
A jet propulsion unit as set forth in claim 7 wherein the ends comprise a pair of resilient legs extending from the curved sections of the S-shaped portion and having tabs at their opposite ends adapted to engage another portion of the conduit for locking the filter element in the conduit.
Claim 11
Dependent Claim
36 words
A jet propulsion unit as set forth in claim 8 wherein the conduit comprises a water tap formed on the housing of the jet propulsion unit and a flexible conduit detachably connected to said water tap.
Claim 12
Dependent Claim
22 words
A jet propulsion unit as set forth in claim 8 wherein the filter element is provided in the inlet to the conduit.
Claim 13
Dependent Claim
45 words
A jet propulsion unit as set forth in claim 10 wherein the conduit comprises a water tap formed on the housing of jet propulsion unit and a flexible conduit detachably connected to said water tap and the filter element is positioned in the water tap.
Claim 14
Dependent Claim
27 words
A jet propulsion unit as set forth in claim 11 wherein the flexible conduit is readily removable from the water tap for removal of the filter element.
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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |