US4135934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal coating compositions
Assignee: National Research Development Corp UK
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Filing: 1976-08-16
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Granted: 1979-01-23
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Expires: 1996-08-16
Abstract
Abstract The use of magnesium azelate as a new rusting inhibitor in metal paints is described. The preferred inhibitor is a mixture of magnesium azelate and a basic oxide e.g. magnesium oxide in the proportion of 3 : 1 to 10 : 1 by weight. The new formulations are substitutes for lead oxide or zinc chromate primers and confer excellent protection on iron and steel.
Inventors
- 👤 John E. O. Mayne
- 👤 Peter J. Heyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:34
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/086
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
In a protective coating composition which protects metal surfaces against corrosion and comprises a film forming vehicle and corrosion inhibitor, the improvement comprising magnesium azelate as said corrosion inhibitor in an effective amount and a minor amount of an alkaline earth metal oxide.
Claim 2
Dependent Claim
43 words
In a protective coating composition which protects metal surfaces against corrosion and comprises a film forming vehicle and corrosion inhibitor, the improvement comprising magnesium azelate as said corrosion inhibitor in an effective amount and a minor amount of an alkaline earth metal oxide.
Claim 3
Dependent Claim
16 words
The protective coating composition of claim 1 wherein the alkaline earth metal oxide is magnesium oxide.
Claim 4
Dependent Claim
28 words
The protective coating composition of claim 1, wherein the proportion of magnesium azelate to alkaline earth metal oxide is in the range from 3:1 to 10:1 by weight.
Claim 5
Dependent Claim
22 words
The protective coating composition of claim 3 in which the proportion of magnesium azelate to alkaline earth metal oxide is about 4:1.
Claim 6
Dependent Claim
31 words
The protective coating composition of claim 1 in which the proportion of magnesium azelate is such as to deposit from about 1% to about 10% by weight of the dry film.
Claim 7
Dependent Claim
25 words
The protective coating composition of claim 5 in which the proportion of magnesium azelate is such as to deposit from 4 to 6% by weight.
Claim 8
Dependent Claim
12 words
The protective coating composition of claim 1, which is free of lead.
Claim 9
Dependent Claim
12 words
The protective coating composition of claim 1 which is free of chromate.
Claim 10
Dependent Claim
51 words
In a method for protecting a metal surface from corrosion by applying to said surface an adherent coating composition containing a film forming vehicle and an effective amount of a corrosion inhibitor, the improvement comprising magnesium azelate as said corrosion inhibitor and a minor amount of an alkaline earth metal oxide.
Claim 11
Dependent Claim
51 words
In a method for protecting a metal surface from corrosion by applying to said surface an adherent coating composition containing a film forming vehicle and an effective amount of a corrosion inhibitor, the improvement comprising magnesium azelate as said corrosion inhibitor and a minor amount of an alkaline earth metal oxide.
Claim 12
Dependent Claim
14 words
The process of claim 9, wherein the alkaline earth metal oxide is magnesium oxide.
Claim 13
Dependent Claim
13 words
The process according of claim 9, wherein the metal is iron or steel.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |