US3932303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition with triethanolamine phosphate ester compositions
Assignee: Calgon Corp
•
Filing: 1973-06-04
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Granted: 1976-01-13
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Expires: 1993-06-04
Abstract
Abstract Use of alkanolamine phosphate ester and at least one member selected from the group consisting of phosphates, phosphonates, and low molecular weight polymers to inhibit the corrosion of metals by oxygen-bearing waters.
Inventors
- 👤 William Robert Hollingshad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:31
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A composition useful for inhibiting the corrosion of metals in a water system which comprises a triethanolamine phosphate ester and at least one member selected from the group consisting of phosphoric acid, phosphonates, and a polyacrylate having a molecular weight of from about 500 to about 10,000.
Claim 2
Dependent Claim
47 words
A composition useful for inhibiting the corrosion of metals in a water system which comprises a triethanolamine phosphate ester and at least one member selected from the group consisting of phosphoric acid, phosphonates, and a polyacrylate having a molecular weight of from about 500 to about 10,000.
Claim 3
Dependent Claim
105 words
A composition as in claim 1 wherein the phosphonate is a composition of the formula: ##EQU5## where Alk is any alkylene carbon group containing 2 to 6 carbon atoms, R may be a member selected from the group consisting of H, --CH 2 COOM and: ##EQU6## M is a member selected from the group consisting of H and a cation forming a water-soluble salt, n = 0 to 14 provided, however, that where n = 0 at least one of the radicals represented by R is: ##EQU7## and where n is greater than zero at least 1/2 of the radicals represented by R is: ##EQU8##
Claim 4
Dependent Claim
19 words
A composition as in claim 2 wherein the phosphonate is amino tris (methylphosphonic acid) or the soluble salts thereof.
Claim 5
Dependent Claim
10 words
A composition as in claim 1 which further contains zinc.
Claim 6
Dependent Claim
19 words
A composition as in claim 1 further comprises a member selected from the group consisting of benzotriazole and mercaptobenzothiazole.
Claim 7
Independent Claim
62 words
A method of inhibiting the corrosion of metals in a water system which comprises maintaining in the water of said system at least about 10 ppm of a composition comprising a triethanolamine phosphate ester and at least one member selected from the group consisting of phosphoric acid, phosphonates, and a polyacrylate having a molecular weight of from about 500 to about 10,000.
Claim 8
Independent Claim
62 words
A method of inhibiting the corrosion of metals in a water system which comprises maintaining in the water of said system at least about 10 ppm of a composition comprising a triethanolamine phosphate ester and at least one member selected from the group consisting of phosphoric acid, phosphonates, and a polyacrylate having a molecular weight of from about 500 to about 10,000.
Claim 9
Dependent Claim
105 words
A method as in claim 6 wherein the phosphonate is a composition of the formula: ##EQU9## where Alk is any alkylene carbon group containing 2 to 6 carbon atoms, R may be a member selected from the group consisting of H, --CH 2 COOM and: ##EQU10## M is a member selected from the group consisting of H and a cation forming a water-soluble salt, n = 0 to 14 provided, however, that where n = 0 at least one of the radicals represented by R is: ##EQU11## and where n is greater than zero at least 1/2 of the radicals represented by R is: ##EQU12##
Claim 10
Dependent Claim
19 words
A method as in claim 7 wherein the phosphonate is amino tris (methylphosphonic acid) or the soluble salts thereof.
Claim 11
Dependent Claim
10 words
A method as in claim 6 which further contains zinc.
Claim 12
Dependent Claim
20 words
A method as in claim 6 which further comprises a member selected from the group consisting of benzotriazole and mercaptobenzothiazole.
References Cited (Backward Citations)
US3388191A
Cited
US3510436A
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US3699048A
Cited
US3620974A
Cited
US3663448A
Cited
US3751372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |