US4174290A
Expired / Lapsed
US
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Metal oxide remover containing a strong mineral acid, citric acid and a basic ammonia derivative
Assignee: Custom Research and Development Inc
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Filing: 1977-09-30
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Granted: 1979-11-13
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Expires: 1997-09-30
Abstract
Abstract Composition and method for removing metal oxides from ferrous metals. The composition contains an ammonia derivative such as an amine, a strong mineral acid and citric acid in an aqueous solution having an acidic pH of about 0.5-3.0. Metal oxides are removed by applying the solution at elevated temperature.
Inventors
- 👤 Newton G. Leveskis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:33
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/26; C11D7/265; C11D7/02; C11D7/04; C11D7/08; C11D7/261; C11D7/32; C11D7/3209; C11D7/3218; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/088
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
85 words
A composition for removing metal oxides from ferrous metals comprising: an aqueous solution containing a basic ammonia derivative selected from ammonium hydroxide and organic amines, citric acid and a strong mineral acid, all of said components being present in effective concentrations to remove metal oxides from the metal to be cleaned in the absence of acid corrosion and discoloration thereof, the pH of said solution being about 0.5-3.0 and the weight ratio of said ammonia derivative to said citric acid being about 2:7 to 7:2.
Claim 2
Dependent Claim
85 words
A composition for removing metal oxides from ferrous metals comprising: an aqueous solution containing a basic ammonia derivative selected from ammonium hydroxide and organic amines, citric acid and a strong mineral acid, all of said components being present in effective concentrations to remove metal oxides from the metal to be cleaned in the absence of acid corrosion and discoloration thereof, the pH of said solution being about 0.5-3.0 and the weight ratio of said ammonia derivative to said citric acid being about 2:7 to 7:2.
Claim 3
Dependent Claim
23 words
A composition for removing metal oxides from ferrous metals in accordance with claim 1, wherein the pH of said solution is about 1.0-2.0.
Claim 4
Dependent Claim
23 words
A composition for removing metal oxides from ferrous metals in accordance with claim 1, wherein the pH of said solution is about 1.5.
Claim 5
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordance with claim 1, wherein said ammonia derivative is ammonium hydroxide.
Claim 6
Dependent Claim
23 words
A composition for removing metal oxides from ferrous metals in accordance with claim 1, wherein said ammonia derivative is an aqueous soluble amine.
Claim 7
Dependent Claim
27 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5, wherein said aqueous soluble amine is selected from alkyl amines and alkanol amines.
Claim 8
Dependent Claim
23 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5, wherein said aqueous soluble amine is a quaternary amine.
Claim 9
Dependent Claim
30 words
A composition for removing metal oxides from ferrous metals in accordance with claim 7, wherein said quarternary amine is an 80% solution in ethanol of n-alkyl dimethyl benzyl ammonium chloride.
Claim 10
Dependent Claim
59 words
A composition for removing metal oxides from ferrous metals having the following formula in approximate parts by weight, said formula being adapted for use as a concentrate or for dilution with additional water: 30 water, 2-7 basic ammonia derivative, 7-2 citric acid, and at least about 0.25-0.5 of strong mineral acid, said formula having a pH of about 1-2.
Claim 11
Dependent Claim
59 words
A composition for removing metal oxides from ferrous metals having the following formula in approximate parts by weight, said formula being adapted for use as a concentrate or for dilution with additional water: 30 water, 2-7 basic ammonia derivative, 7-2 citric acid, and at least about 0.25-0.5 of strong mineral acid, said formula having a pH of about 1-2.
Claim 12
Dependent Claim
18 words
A composition for removing metal oxides in accordance with claim 9, wherein the mineral acid is hydrochloric acid.
Claim 13
Dependent Claim
28 words
A method for removing metal oxides from ferrous metals comprising: contacting the metal from which rust is to be removed with a composition in accordance with claim 1.
Claim 14
Dependent Claim
28 words
A method for removing metal oxides from ferrous metals comprising: contacting the metal from which rust is to be removed with a compositon in accordance with claim 3.
Claim 15
Dependent Claim
28 words
A method for removing metal oxides from ferrous metals comprising: contacting the metal from which rust is to be removed with a compositing in accordance with claim 5.
Claim 16
Dependent Claim
20 words
A method for removing metal oxides in accordance with claim 11, wherein said contact is executed at an elevated temperature.
Claim 17
Dependent Claim
31 words
A method for removing metal oxides in accordance with claim 13, wherein said contact is executed by spraying said composition on the metal at an elevated temperature of about 120°-212° F.
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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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |