US4250048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal oxide remover containing a strong mineral acid, chelating agent and a basic ammonia derivative
Assignee: Custom Research and Development Inc
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Filing: 1979-07-03
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Granted: 1981-02-10
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Expires: 1999-07-03
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 an organic chelating agent for the metal oxides in an aqueous solution having an acidic pH of about 0.5-3.0. Metal oxides are most readily removed by applying the solution at elevated temperature.
Inventors
- 👤 Newton G. Leveskis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:11
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
95 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, an organic chelating agent for the metal oxides other than 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 chelating agent being about 2:7 to 7:2.
Claim 2
Dependent Claim
95 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, an organic chelating agent for the metal oxides other than 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 chelating agent 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 0.5-1.5.
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 quaternary amine is an 80% solution in ethanol of n-alkyl dimethyl benzyl ammonium chloride.
Claim 10
Dependent Claim
30 words
A composition for removing metal oxides from ferrous metals in accordance with claim 1 wherein said chelating agent contains two or more functional groups selected from acid, hydroxyl and amino.
Claim 11
Dependent Claim
27 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is soluble in the aqueous media of said composition.
Claim 12
Dependent Claim
25 words
A composition for removing metal oxides from ferrous metals in accordance with claim 10 said composition has a temperature of about 120°-212° F. (49°-100° C.).
Claim 13
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordanec with claim 5 wherein said chelating agent is gluconic acid.
Claim 14
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is tartaric acid.
Claim 15
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is malic acid.
Claim 16
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is ascorbic acid.
Claim 17
Dependent Claim
20 words
A composition for removing oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is hydroxyethanediphosphonic acid.
Claim 18
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is diethylenetriaminepentaacetic acid.
Claim 19
Dependent Claim
21 words
A composition for removing metal oxides from ferrous metals in accordance with claim 5 wherein said chelating agent is ethylenediaminetetraacetic acid.
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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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |