US4018701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorous acid and zinc corrosion inhibiting compositions and methods for using same
Assignee: ECC SPECIALTY CHEMICALS Inc
•
Filing: 1975-07-31
•
Granted: 1977-04-19
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Expires: 1995-07-31
Abstract
Abstract Use of phosphorous acid (H3PO3) and zinc to inhibit the corrosion of metals by oxygen-bearing waters.
Inventors
- 👤 Paul Hotchkiss Ralston
- 👤 Bennett Patsy Boffardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:07
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/187; C23F11/188
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
18 words
A composition useful for inhibiting the corrosion of metals in a water system comprising phosphorous acid and zinc.
Claim 2
Dependent Claim
18 words
A composition useful for inhibiting the corrosion of metals in a water system comprising phosphorous acid and zinc.
Claim 3
Dependent Claim
23 words
A composition as in claim 1 wherein the ratio of phosphorous acid to zinc is from about 1:1 to about 15:1 by weight.
Claim 4
Dependent Claim
21 words
A composition as in claim 2 wherein the ratio of phosphorous acid to zinc is from about 5:1 to about 10:1.
Claim 5
Dependent Claim
21 words
A composition as in claim 1 which further comprises a member selected from the group consisting of benzotriazole, tolyltriazole and mercaptobenzothiazole.
Claim 6
Dependent Claim
12 words
A composition as in claim 1 which further comprises a water-soluble polymer.
Claim 7
Dependent Claim
20 words
A composition as in claim 5 wherein the ratio of zinc to polymer is from about 1:1 to about 100:1.
Claim 8
Independent Claim
33 words
A method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least about 1 ppm of a composition comprising phosphorous acid and zinc.
Claim 9
Independent Claim
33 words
A method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least about 1 ppm of a composition comprising phosphorous acid and zinc.
Claim 10
Dependent Claim
23 words
A method as in claim 7 wherein the ratio of phosphorous acid to zinc is from about 1:1 to about 15:1 by weight.
Claim 11
Dependent Claim
21 words
A method as in claim 8 wherein the ratio of phosphorous acid to zinc is from about 5:1 to about 10:1.
Claim 12
Dependent Claim
16 words
A method as in claim 7 wherein at least 5 ppm of the composition are present.
Claim 13
Dependent Claim
18 words
A method as in claim 7 wherein 0.1 ppm of a water-soluble polymer is maintained in said system.
References Cited (Backward Citations)
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US3803047A
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US3803048A
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US3489682A
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US3510436A
Cited
US3655556A
Cited
US3885914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |