US4355079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition
Assignee: WR Grace and Co Conn
•
Filing: 1981-04-21
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Granted: 1982-10-19
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Expires: 2001-04-21
Abstract
Abstract This invention is directed to coating metal elements with a thin film of calcium nitrite (including compositions containing same) whereby the metal is inhibited against corrosion on being placed in hydraulic cement.
Inventors
- 👤 Arnold M. Rosenberg
- 👤 James M. Gaidis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/01; E04C5/015; C; C04; C04B; C04B28/00; C04B28/02; C04B2103/00; C04B2103/10; C04B2103/12; C04B2111/00; C04B2111/20; C04B2111/26; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
52 words
An article consisting essentially of a metal piece coated with a thin film of from about 0.005 to about 0.375 inch thick consisting essentially of calcium nitrite and a cement-free carrier, said composition being applied as a film on the metal piece and said metal being iron, steel, aluminum or aluminum-steel alloy.
Claim 2
Dependent Claim
52 words
An article consisting essentially of a metal piece coated with a thin film of from about 0.005 to about 0.375 inch thick consisting essentially of calcium nitrite and a cement-free carrier, said composition being applied as a film on the metal piece and said metal being iron, steel, aluminum or aluminum-steel alloy.
Claim 3
Dependent Claim
21 words
The article according to claim 1 in which the calcium nitrite film coating is from about 0.005 to 0.06 inch thick.
Claim 4
Dependent Claim
28 words
The article according to claim 1 wherein the metal of said piece is an iron containing metal selected from the group consisting of iron, steel and steel-aluminum alloy.
Claim 5
Dependent Claim
21 words
The article according to claim 2 in which the composition is formed of water soluble components applied as an aqueous solution.
Claim 6
Dependent Claim
38 words
An article consisting essentially of a metal piece coated with a thin film of from about 0.005 to about 0.375 inch thick consisting essentially of calcium nitrite, said composition being applied as a film on the aluminum-steel alloy.
Claim 7
Dependent Claim
38 words
An article consisting essentially of a metal piece coated with a thin film of from about 0.005 to about 0.375 inch thick consisting essentially of calcium nitrite, said composition being applied as a film on the aluminum-steel alloy.
Claim 8
Dependent Claim
62 words
An article comprising an alite cement which is free of nitrite salt and metal pieces embedded therein, said metal pieces being precoated with a thin film of from about 0.005 to about 0.375 inch thick of a coating composition containing calcium nitrite, said composition being applied as a film on the metal and said metal being iron, steel, aluminum or aluminum-steel alloy.
Claim 9
Dependent Claim
62 words
An article comprising an alite cement which is free of nitrite salt and metal pieces embedded therein, said metal pieces being precoated with a thin film of from about 0.005 to about 0.375 inch thick of a coating composition containing calcium nitrite, said composition being applied as a film on the metal and said metal being iron, steel, aluminum or aluminum-steel alloy.
Claim 10
Dependent Claim
20 words
The article according to claim 6 wherein the calcium nitrite film coating is from about 0.005 to 0.06 inch thick.
Claim 11
Dependent Claim
31 words
The article according to claim 6 wherein the metal of said metal piece contained therein is an iron containing metal selected from the group consisting of iron, steel and steel-aluminum alloy.
Claim 12
Dependent Claim
15 words
The article according to claim 6 wherein the coating composition consists essentially of calcium nitrite.
Claim 13
Dependent Claim
32 words
The article according to claim 6 wherein the coating composition is formed of water soluble components applied as an aqueous solution and having from 10 to 40 percent by weight calcium nitrite.
Claim 14
Dependent Claim
16 words
The article according to claim 6 further comprising a water reducing agent admixed with the cement.
Claim 15
Dependent Claim
15 words
The article according to claim 6 in which the water reducing agent is calcium lignosulfonate.
Claim 16
Dependent Claim
17 words
The article according to claim 6 further comprising a plasticizer and a retarder admixed with the cement.
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) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |