US3985503A
Expired / Lapsed
US
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Process for inhibiting metal corrosion
Assignee: PMC Inc
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Filing: 1975-03-17
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Granted: 1976-10-12
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Expires: 1995-03-17
Abstract
Abstract This invention is directed to the use of substituted benzotriazoles and more specifically the carboxylated benzotriazoles including the alkali metal salts and alkyl esters thereof as inhibitors for metal in various corrosive organic liquids and aqueous mediums.
Inventors
- 👤 Cleveland O'Neal, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:37
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
41 words
A process for inhibiting the corrosion of metals in contact with corrosive organic liquids and aqueous systems which comprises adding to the organic liquid or aqueous system a corrosion inhibiting amount of at least one carboxylated benzotriazole having the formula: ##SPC2##
Claim 2
Dependent Claim
41 words
A process for inhibiting the corrosion of metals in contact with corrosive organic liquids and aqueous systems which comprises adding to the organic liquid or aqueous system a corrosion inhibiting amount of at least one carboxylated benzotriazole having the formula: ##SPC2##
Claim 3
Dependent Claim
24 words
wherein R 1 is selected from the class consisting of hydrogen, an alkali metal and an aliphatic radical of 1 to 12 carbon atoms.
Claim 4
Dependent Claim
24 words
wherein R 1 is selected from the class consisting of hydrogen, an alkali metal and an aliphatic radical of 1 to 12 carbon atoms.
Claim 5
Dependent Claim
43 words
The process of claim 1 further characterized in that the carboxylated benzotriazole is added to an aqueous system in corrosion inhibiting amounts ranging up to about 5000 parts by weight of the benzotriazole for every million parts by weight of the aqueous system.
Claim 6
Dependent Claim
44 words
The process of claim 1 further characterized in that the carboxylated benzotriazole is added to a corrosive organic liquid in corrosive inhibiting amount ranging up to about 5000 parts by weight of the benzotriazole for every million parts by weight of the organic liquid.
Claim 7
Dependent Claim
18 words
The process of claim 2 further characterized in that the aqueous system comprises a major amount of water.
Claim 8
Dependent Claim
27 words
The process of claim 2 further characterized in that an alcohol is present in the aqueous system in an amount ranging up to about 99% by weight.
Claim 9
Dependent Claim
19 words
The process of claim 5 further characterized in that the alcohol is a lower molecular weight monohydric aliphatic alcohol.
Claim 10
Dependent Claim
16 words
The process of claim 5 further characterized in that the alcohol is a polyhydric aliphatic alcohol.
Claim 11
Dependent Claim
15 words
The process of claim 7 further characterized in that the polyhydric alcohol is ethylene glycol.
Claim 12
Dependent Claim
18 words
The process of claim 3 further characterized in that the corrosive organic liquid comprises an aliphatic organic solvent.
Claim 13
Dependent Claim
18 words
The process of claim 3 further characterized in that the corrosive organic liquid comprises an aromatic organic solvent.
Claim 14
Dependent Claim
40 words
The process of claim 1 further characterized in that the metals in contact with the corrosive organic liquid and the aqueous system are selected from the class consisting of copper, aluminum, iron and the alloys of copper, aluminum and iron.
Claim 15
Dependent Claim
13 words
The process of claim 1 further characterized in that R 1 is hydrogen.
Claim 16
Dependent Claim
15 words
The process of claim 1 further characterized in that R 1 is an alkali metal.
Claim 17
Dependent Claim
15 words
The process of claim 1 further characterized in that R 1 is an aliphatic radical.
Claim 18
Dependent Claim
41 words
The process of claim 1 further characterized in that the aqueous system contains the carboxylated benzotriazole in an amount ranging from about 0.01 to 5000 parts by weight of the benzotriazole for every million parts by weight of the aqueous system.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |