US4506485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibiting corrosion of metal embedded in concrete and a reinforced concrete construction
Assignee: California Department of Transportation
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Filing: 1983-04-12
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Granted: 1985-03-26
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Expires: 2003-04-12
Abstract
Abstract Electrically conductive metal is melted, preferably by a flame, and is sprayed onto a freshly exposed, pitted surface of a concrete member having iron embedded therein. The sprayed metal, when cooled, forms a metal cover on and interlocked with at least part of the newly exposed surface. The cover and the embedded iron are preferably joined in an electric circuit affording a direct current electromotive force, effectively opposite to that which normally would occur, in order to preclude the deterioration of the contained iron.
Inventors
- 👤 John A. Apostolos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:32
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; E; E04; E04B; E04B1/00; E04B1/62; E04B1/64; E04B1/642; C23F2201/00; C23F2201/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A process for inhibiting corrosion of iron embedded in concrete wherein the concrete has an exterior exposed to a moist, saline environment comprising sandblasting said exterior to remove the existing surface thereof and to leave a newly exposed surface thereon, then promptly flame-spraying a metal onto at least part of said newly exposed surface, to form a cover thereon, and then connecting said cover and said iron in a circuit containing a source of electricity.
Claim 2
Dependent Claim
75 words
A process for inhibiting corrosion of iron embedded in concrete wherein the concrete has an exterior exposed to a moist, saline environment comprising sandblasting said exterior to remove the existing surface thereof and to leave a newly exposed surface thereon, then promptly flame-spraying a metal onto at least part of said newly exposed surface, to form a cover thereon, and then connecting said cover and said iron in a circuit containing a source of electricity.
Claim 3
Dependent Claim
15 words
A process as in claim 1 in which said cover is an electrically conductive metal.
Claim 4
Dependent Claim
27 words
A process as in claim 1 in which said iron acts as a cathode in said circuit and said cover acts as an anode in said circuit.
Claim 5
Dependent Claim
15 words
A process as in claim 1 in which said source of electricity furnishes direct current.
Claim 6
Dependent Claim
27 words
A process as in claim 1 in which said cover is formed on said exterior before said exterior has been substantially deteriorated by exposure to said environment.
Claim 7
Dependent Claim
56 words
A concrete structure reinforced with an interior iron bar and having an external surface that has been substantially unexposed to the atmosphere, a cover of flame-sprayed metal on said surface and disposed between said surface and the atmosphere, and means for subjecting said cover and said iron bar to a current opposing deterioration of said bar.
Claim 8
Dependent Claim
56 words
A concrete structure reinforced with an interior iron bar and having an external surface that has been substantially unexposed to the atmosphere, a cover of flame-sprayed metal on said surface and disposed between said surface and the atmosphere, and means for subjecting said cover and said iron bar to a current opposing deterioration of said bar.
Claim 9
Dependent Claim
59 words
A concrete structure reinforced with a pre-tensioned interior member of ferrous material and having an external surface that has been substantially unexposed to the atmosphere, a coating of flame-sprayed metal on said surface and disposed between said surface and the atmosphere, and means for subjecting said coating and said ferrous member to a current opposing deterioration of said member.
Claim 10
Dependent Claim
59 words
A concrete structure reinforced with a pre-tensioned interior member of ferrous material and having an external surface that has been substantially unexposed to the atmosphere, a coating of flame-sprayed metal on said surface and disposed between said surface and the atmosphere, and means for subjecting said coating and said ferrous member to a current opposing deterioration of said member.
Claim 11
Dependent Claim
23 words
A structure as in claim 7 in which the concrete is pre-cast and said ferrous member includes at least one steel wire cable.
Claim 12
Dependent Claim
17 words
A structure as in claim 7 in which said ferrous member is a pretensioned reinforced concrete tank.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |