US4489277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodic protection monitoring system
Assignee: Shell USA Inc
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Filing: 1982-01-04
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Granted: 1984-12-18
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Expires: 2002-01-04
Abstract
Abstract An apparatus for monitoring a cathodic protection system on a structure which is positioned in water such that a portion of the structure is beneath the surface of the water, such apparatus comprising: an insulating means positioned adjacent to the structure below the surface of the water; a metallic body positioned adjacent to the insulating means so that the body is electrically insulated from the structure; means for electrically connecting the body to the structure at a point above the surface of the water; and means for measuring the amount of current flowing through the electrical connecting means.
Inventors
- 👤 Alvin D. Goolsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:25
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; G; G01; G01N; G01N17/00; G01N17/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
An apparatus for monitoring a cathodic protection system on a structure which is positioned in water such that a portion of said structure is beneath the surface of said water, comprising: an insulating means positioned adjacent to said structure below the surface of said water; a metallic body positioned adjacent to said insulating means so that said body is electrically insulated from said structure; means for electrically connecting said body of said structure at a point above the surface of said water; means for measuring the amount of current flowing through said electrical connecting means; a half cell positioned near said body; means connected to said body and said half cell for measuring the voltage difference across said body and said half cell; and means connected to said current measuring means for determining the current density on said body.
Claim 2
Independent Claim
139 words
An apparatus for monitoring a cathodic protection system on a structure which is positioned in water such that a portion of said structure is beneath the surface of said water, comprising: an insulating means positioned adjacent to said structure below the surface of said water; a metallic body positioned adjacent to said insulating means so that said body is electrically insulated from said structure; means for electrically connecting said body of said structure at a point above the surface of said water; means for measuring the amount of current flowing through said electrical connecting means; a half cell positioned near said body; means connected to said body and said half cell for measuring the voltage difference across said body and said half cell; and means connected to said current measuring means for determining the current density on said body.
Claim 3
Independent Claim
140 words
An apparatus for monitoring a cathodic protection system on a structure which is positioned in water such that a portion of said structure is beneath the surface of said water, comprising: a rubber insulating means positioned adjacent to said structure below the surface of said water; a steel plate positioned adjacent to said insulating means so that said plate is electrically insulated from said structure; means for electrically connecting said plate to said structure at a point above the surface of said water; means for measuring the amount of current flowing through said electrical connecting means; a half cell positioned near said plate; means connected to said plate and said half cell for measuring the voltage difference across said plate and said half cell; and means connected to said current measuring means for determining the current density on said body.
Claim 4
Independent Claim
140 words
An apparatus for monitoring a cathodic protection system on a structure which is positioned in water such that a portion of said structure is beneath the surface of said water, comprising: a rubber insulating means positioned adjacent to said structure below the surface of said water; a steel plate positioned adjacent to said insulating means so that said plate is electrically insulated from said structure; means for electrically connecting said plate to said structure at a point above the surface of said water; means for measuring the amount of current flowing through said electrical connecting means; a half cell positioned near said plate; means connected to said plate and said half cell for measuring the voltage difference across said plate and said half cell; and means connected to said current measuring means for determining the current density on said body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |