US3723347A
Expired / Lapsed
US
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Corrosion inhibition compositions containing substituted diamine phosphonates and processes for using the same
Assignee: Monsanto Co
•
Filing: 1972-05-17
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Granted: 1973-03-27
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Expires: 1992-05-17
Abstract
Abstract WHEREIN R1, R2, R3, R4, X, Y and Z are hereinafter defined and n is 0 - 10, alone or in combination with zinc, dichromates, certain thiols, 1,2,3-triazoles, silicates, inorganic phosphates, molybdates, tannins, lignins, lignin sulfonates, certain calcium and magnesium salts and mixtures thereof, are disclosed as inhibiting the corrosion of metals by oxygen-bearing waters. Substituted diamine phosphonates of the general formula
Inventors
- 👤 R Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:48
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
15 words
The composition as set forth in claim 1 wherein X and Y both are hydrogen.
Claim 2
Dependent Claim
15 words
The composition as set forth in claim 2 wherein R1 and R2 are each hydrogen.
Claim 3
Dependent Claim
29 words
ThE composition as set forth in claim 2 wherein R1 and R2 are each a cation selected from the group consisting of alkali metals, ammonia, zinc, and mixtures thereof.
Claim 4
Dependent Claim
26 words
The composition as set forth in claim 4 wherein the water-soluble zinc salt is zinc sulfate and at least one of R1 and R2 is sodium.
Claim 5
Dependent Claim
17 words
The composition as set forth in claim 1 and additionally containing a water-soluble hexavalent compound of chromium.
Claim 6
Dependent Claim
39 words
A composition useful for inhibiting the corrosion of metals in a water system which contains cuprous metals consisting essentially of (1) from about 20 percent to about 90 percent by weight of a substituted diamine having the general formula
Claim 7
Dependent Claim
17 words
The composition as set forth in claim 7 and additionally containing a water-soluble hexavalent compound of chromium.
Claim 8
Dependent Claim
47 words
A composition useful for inhibiting the corrosion of metals in a water system consisting essentially of from about 2 to about 80 percent by weight of a silicate and from about 20 percent to about 98 percent by weight of a substituted diamine having the general formula
Claim 9
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 10
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 11
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 12
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 13
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 14
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 15
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 16
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 17
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 18
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 19
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 20
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 21
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 22
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 23
Dependent Claim
15 words
The composition as set forth in claim 1 wherein the substituted diamine has the formula
Claim 24
Independent Claim
34 words
The method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least 3 parts per million of a substituted diamine having the general formula
Claim 25
Dependent Claim
15 words
The method as set forth in claim 25 wherein X and Y both are hydrogen.
Claim 26
Dependent Claim
15 words
The method as set forth in claim 26 wherein R1 and R2 are each hydrogen.
Claim 27
Dependent Claim
29 words
The method as set forth in claim 26 wherein R1 and R2 are each a cation selected from the group consisting of alkali metals, ammonia, zinc, and mixtures thereof.
Claim 28
Dependent Claim
20 words
The method as set forth in claim 25 and additionally containing in said system a water-soluble hexavalent compound of chromium.
Claim 29
Dependent Claim
18 words
The method as set forth in claim 25 and additionally containing in said system a water-soluble zinc salt.
Claim 30
Dependent Claim
25 words
The method as set forth in claim 25 and additionally containing in said system a water-soluble hexavalent compound of chromium and a water-soluble zinc salt.
Claim 31
Dependent Claim
41 words
The method as set forth in claim 25 wherein said system contains cuprous metals and the water system additionally contains a compound selected from the group consisting of 1,2,3-triazoles, thiols of thiazoles, thiols of oxazoles, thiols of imidazoles, and mixtures thereof.
Claim 32
Dependent Claim
18 words
The method as set forth in claim 32 wherein the water system additionally contains a water-soluble zinc salt.
Claim 33
Independent Claim
53 words
A method of inhibiting metal corrosion in a water system containing metals comprising maintaining in the water of said system (a) from about 3 to about 100 ppm of a substituted diamine having the formula or its water-soluble salts and (b) up to about 100 ppm zinc ion derived from water-soluble zinc salts.
References Cited (Backward Citations)
US2961311A
Cited
US3160632A
Cited
US3336221A
Cited
US3298956A
Cited
US3395113A
Cited
US3431217A
Cited
US3483133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |