US3876371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of corrosion
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1974-01-24
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Granted: 1975-04-08
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Expires: 1994-01-24
Abstract
Abstract A method of inhibiting the corrosion of steel by acidic compounds, which comprises adding to the acidic compound an organic nitrogen compound containing at least one unsaturated carbon-nitrogen bond (other than a cyclic vicinal dinitrile) or by pre-treatment of the steel with the organic nitrogen compound or by a combination of both methods.
Inventors
- 👤 Winston Costain
- 👤 Bernard William Hugh Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:07
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/061; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/086; C23F; C23F11/00; C23F11/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
A METHOD OF INHIBITING THE CORROSION OF STEEL BY ACIDIC COMPOUNDS WHICH COMPRISES ADDING TO THE ACIDIC COMPOUND AN EFFECTIVE AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITRILES, ALDOXIMES AND KETOXIMES, WHEREIN THE NITRILE IS FURTHER SELECTED FROM THE GROUP CONSISTING OF NITRILES IN WHICH THE NITRILE GROUP IS ATTACHED TO AN UNSATURATED ALIPHATIC CARBON CHAIN TO FORM A CONJUGATED SYSTEM INCLUDING THE NITRILE GROUP AND AT LEAST TWO DOUBLE BONDS IN THE CHAIN, AND NITRILES IN WHICH THE NITRILE GROUP IS ATTACHED TO AN UNSATURATED ALIPHATIC CARBON CHAIN WHICH IS ITSELF ATTACHED TO A BENZENE NUCLEUS TO FORM A CONJUGATED SYSTEM INCLUDING THE NITRILE GROUP, THE BENZENE NUCLEUS AND AT LEAST ONE DOUBLE BOND IN THE UNSATURATED ALIPHATIC CARBON CHAIN; AND WHEREIN THE ALDOXIMES AND KETOXIMES ARE FURTHER SELECTED FROM THE GROUP CONSISTING OF ORTHOBENZENE QUINONE DIOXIME, PARABENZOQUINONE DIOXIME, ALDOXIMES AND KETOXIMES IN WHICH THE OXIME GROUP IS DIRECTLY ATTACHED TO A BENZENE NUCLEUS AND ALDOXIMES AND KETOXIMES IN WHICH THE OXIME GROUP IS ATTACHED TO A BENZENE NUCLEUS THROUGH AN UNSATURATED ALIPHATIC CARBON CHAIN TO FORM A CONJUGATED SYSTEM INCLUDING THE BENZENE NUCLEUS, THE OXIME GROUP AND AT LEAST ONE DOUBLE BOND IN THE UNSATURATED ALIPHATIC CARBON CHAIN.
Claim 2
Independent Claim
203 words
A METHOD OF INHIBITING THE CORROSION OF STEEL BY ACIDIC COMPOUNDS WHICH COMPRISES ADDING TO THE ACIDIC COMPOUND AN EFFECTIVE AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITRILES, ALDOXIMES AND KETOXIMES, WHEREIN THE NITRILE IS FURTHER SELECTED FROM THE GROUP CONSISTING OF NITRILES IN WHICH THE NITRILE GROUP IS ATTACHED TO AN UNSATURATED ALIPHATIC CARBON CHAIN TO FORM A CONJUGATED SYSTEM INCLUDING THE NITRILE GROUP AND AT LEAST TWO DOUBLE BONDS IN THE CHAIN, AND NITRILES IN WHICH THE NITRILE GROUP IS ATTACHED TO AN UNSATURATED ALIPHATIC CARBON CHAIN WHICH IS ITSELF ATTACHED TO A BENZENE NUCLEUS TO FORM A CONJUGATED SYSTEM INCLUDING THE NITRILE GROUP, THE BENZENE NUCLEUS AND AT LEAST ONE DOUBLE BOND IN THE UNSATURATED ALIPHATIC CARBON CHAIN; AND WHEREIN THE ALDOXIMES AND KETOXIMES ARE FURTHER SELECTED FROM THE GROUP CONSISTING OF ORTHOBENZENE QUINONE DIOXIME, PARABENZOQUINONE DIOXIME, ALDOXIMES AND KETOXIMES IN WHICH THE OXIME GROUP IS DIRECTLY ATTACHED TO A BENZENE NUCLEUS AND ALDOXIMES AND KETOXIMES IN WHICH THE OXIME GROUP IS ATTACHED TO A BENZENE NUCLEUS THROUGH AN UNSATURATED ALIPHATIC CARBON CHAIN TO FORM A CONJUGATED SYSTEM INCLUDING THE BENZENE NUCLEUS, THE OXIME GROUP AND AT LEAST ONE DOUBLE BOND IN THE UNSATURATED ALIPHATIC CARBON CHAIN.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein the acidic compound is a carboxylic acid.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 wherein the acidic compound is an organic sulphonic acid or an inorganic acid.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 1 wherein the corrosion inhibiting compound is a conjugated unsaturated nitrile selected from the group consisting of cinnamonitrile, p-methoxy-cinnamonitrile, phenylmaleonitrile and 1-cyano-4-phenylbuta-1,3-diene.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1 wherein the corrosion inhibiting compound is a conjugated unsaturated oxime selected from the group consisting of cinnamaldoxime, benzalacetoxime, acetophenoneoxime and dibenzalacetoxime.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |