Patent US1136148A successfully refreshed from Google Patents.
Patent US4849171A successfully refreshed from Google Patents.
US4849171A
Expired / Lapsed
US
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Corrosion inhibition of sodium and calcium chloride
Assignee: Individual
•
Filing: 1987-02-09
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Granted: 1989-07-18
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Expires: 2007-02-09
Abstract
Abstract A corrosion inhibited sodium and calcium chloride composition preferably in granular form, which is uniformly coated with a minute to minor quantity of an inhibitor comprising chiefly superphosphate and a minor amount of magnesium oxide. There is also disclosed a method for inhibiting corrosion of sodium and calcium chloride which comprises supplying to the metal surface which is exposed to corrosive attack by sodium and calcium chloride, a minute quantity of an inhibitor comprising chiefly superphosphate and a minor amount of magnesium oxide. The magnesium oxide functions to cement the inhibitor as a tenacious coating on the salt granules, and also to enhance the effectiveness of the phosphate corrosion inhibition.
Inventors
- 👤 Bruce Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:46
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/187; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
The method of inhibiting the corrosion of metal surfaces by brines of salts selected from the group consisting of sodium and calcium chlorides which comprises: a. incorporating in said brines an inhibitor mixture consisting essentially of magnesium oxide and superphosphate in weight proportions from 0.1 part magnesium oxide per part superphosphate, in a weight amount of 1 part inhibitor mixture per 100 to 400 parts of said salt, sufficient to inhibit the corrosion of said brines on metal surfaces.
Claim 2
Independent Claim
79 words
The method of inhibiting the corrosion of metal surfaces by brines of salts selected from the group consisting of sodium and calcium chlorides which comprises: a. incorporating in said brines an inhibitor mixture consisting essentially of magnesium oxide and superphosphate in weight proportions from 0.1 part magnesium oxide per part superphosphate, in a weight amount of 1 part inhibitor mixture per 100 to 400 parts of said salt, sufficient to inhibit the corrosion of said brines on metal surfaces.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said inhibitor is present in an amount from one part per 175 to about 250 parts of said salt.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said inhibitor is present in an amount from one part per 200 parts of said salt.
Claim 5
Dependent Claim
33 words
The method of claim 1 including the step of dispersing said inhibitor composition in said brines in a sufficient quantity to provide sufficient superphosphate to form a passivating film on said metal surface.
Claim 6
Dependent Claim
38 words
The method of claim 4 as applied to the prevention of corrosion wherein said metal surfaces are the metal surfaces of vehicles exposed to calcium chloride brines formed from calcium chloride applied to road surfaces as a cover.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |