US4559017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant voltage anode system
Assignee: Outboard Marine Corp
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Filing: 1983-09-12
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Granted: 1985-12-17
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Expires: 2003-09-12
Abstract
Abstract A marine propulsion unit having a housing exposed to sea water and subject to attack by the sea water is provided with a permanent type anode housing substantially constant surface characteristics mounted on the housing and supplied with constant voltage. Holes under the anode through the housing to interior passages permits the current on the anode to influence and protect the passages.
Inventors
- 👤 David T. Cavil
- 👤 William R. Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:00
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
The combination with a marine drive unit having a lower housing exposed to sea water and having an internal passage also exposed to sea water, of means providing cathodic protection to said lower housing, comprising, an aperture between an outside surface of the housing and an inside surface of the passage, an anode mounted on one of the surfaces and exposed to the adjacent conditions and also exposed to the conditions adjacent the other surface.
Claim 2
Dependent Claim
75 words
The combination with a marine drive unit having a lower housing exposed to sea water and having an internal passage also exposed to sea water, of means providing cathodic protection to said lower housing, comprising, an aperture between an outside surface of the housing and an inside surface of the passage, an anode mounted on one of the surfaces and exposed to the adjacent conditions and also exposed to the conditions adjacent the other surface.
Claim 3
Dependent Claim
31 words
The combination in accordance with claim 1 in which said anode is a permanent type of anode having constant surface characteristics, and including means impressing a constant voltage on said anode.
Claim 4
Dependent Claim
31 words
The combination in accordance with claim 2 in which there are multiple passages in said lower housing and there are apertures into each passage, said anode being mounted over each aperture.
Claim 5
Dependent Claim
36 words
The combination in accordance with claim 3 in which the anode has very constant surface characteristics, particularly constant surface impedance to water, and does not dissolve in sea water within the service life of the motor.
Claim 6
Dependent Claim
16 words
The combination in accordance with claim 4 in which the lower housing is an aluminum alloy.
Claim 7
Dependent Claim
24 words
The combination in accordance with claim 5 in which the anode is mounted on the outside of the lower housing and is insulated therefrom.
Claim 8
Dependent Claim
13 words
The combination in accordance with claim 6 in which the anode is carbon.
Claim 9
Dependent Claim
13 words
The combination in accordance with claim 6 in which the anode is ferrite.
Claim 10
Dependent Claim
13 words
The combination in accordance with claim 6 in which the anode is magnetile.
Claim 11
Dependent Claim
77 words
A marine drive unit comprising a housing exposed to sea water and subject to attack by the sea water, and including an internal passage, a permanent type anode having substantially constant surface characteristics mounted on the housing, said anode being mounted on and insulated from said housing in a position outside said passage, said housing being apertured so that said internal passage is exposed to said anode, and means for impressing a constant voltage on said anode.
Claim 12
Dependent Claim
77 words
A marine drive unit comprising a housing exposed to sea water and subject to attack by the sea water, and including an internal passage, a permanent type anode having substantially constant surface characteristics mounted on the housing, said anode being mounted on and insulated from said housing in a position outside said passage, said housing being apertured so that said internal passage is exposed to said anode, and means for impressing a constant voltage on said anode.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |