Patent US4586961A successfully refreshed from Google Patents.
US4586961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and compositions for removing copper and copper oxides from surfaces
Assignee: Halliburton Co
•
Filing: 1985-02-15
•
Granted: 1986-05-06
•
Expires: 2005-02-15
Abstract
Abstract Methods and compositions for removing copper and copper oxide deposits from metal surfaces including surfaces formed of austenitic, nickel-chromium and other similar alloys without adversely affecting such surfaces are provided. The copper and copper oxide deposits are dissolved in an aqueous ammoniacal cleaning solution which includes one or more alkali metal or ammonium perborate oxidizing agents.
Inventors
- 👤 Gary W. Bradley
- 👤 Stephen T. Arrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:21
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23F; C23F1/00; C23F1/44; F; F28; F28G; F28G9/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
36 words
A method of removing copper and copper oxide deposits from austenitic or nickel-chromium alloy surfaces containing such deposits comprising contacting said deposits with an aqueous ammoniacal solution consisting essentially of a water soluble perborate oxidizing agent.
Claim 2
Independent Claim
36 words
A method of removing copper and copper oxide deposits from austenitic or nickel-chromium alloy surfaces containing such deposits comprising contacting said deposits with an aqueous ammoniacal solution consisting essentially of a water soluble perborate oxidizing agent.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said oxidizing agent is sodium perborate.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said aqueous ammoniacal solution further consists essentally of ammonia and ammonium bicarbonate.
Claim 5
Dependent Claim
84 words
The method of claim 3 wherein said ammonia is present in said solution in an amount in the range of from about 0.05% to about 15% by weight of said solution, said ammonium bicarbonate is present in said solution in an amount in the range of from about 0.04% to about 10% by weight of said solution and said sodium perborate is present in said solution in an amount in the range of from about 0.05% to about 5% by weight of said solution.
Claim 6
Independent Claim
97 words
A method of dissolving copper and copper oxide deposits from austenitic or nickel-chromium alloy surfaces in a cleaning solution without adversely affecting said surfaces comprising contacting said deposits with an aqueous ammoniacal cleaning solution consisting essentially of: water; ammonia present in said solution in an amount of about 9.7% by weight of said solution; ammonium bicarbonate present in said solution in an amount of about 10% by weight of said solution; and one or more alkali metal or ammonium perborate oxidizing agents present in said solution in an amount of about 1% by weight of said solution.
Claim 7
Independent Claim
97 words
A method of dissolving copper and copper oxide deposits from austenitic or nickel-chromium alloy surfaces in a cleaning solution without adversely affecting said surfaces comprising contacting said deposits with an aqueous ammoniacal cleaning solution consisting essentially of: water; ammonia present in said solution in an amount of about 9.7% by weight of said solution; ammonium bicarbonate present in said solution in an amount of about 10% by weight of said solution; and one or more alkali metal or ammonium perborate oxidizing agents present in said solution in an amount of about 1% by weight of said solution.
Claim 8
Dependent Claim
12 words
The method of claim 5 wherein said oxidizing agent is sodium perborate.
Claim 9
Independent Claim
68 words
A method of removing copper and copper oxide deposits from austenitic or nickel-chromium alloys surfaces containing said deposits without adversely affecting said surfaces comprising the steps of: contacting said surfaces containing said deposits with an aqueous ammoniacal cleaning solution consisting essentially of one or more alkali metal or ammonium perborate oxidizing agents; and removing said cleaning solution from contact with said surfaces after said deposits have dissolved therein.
Claim 10
Independent Claim
68 words
A method of removing copper and copper oxide deposits from austenitic or nickel-chromium alloys surfaces containing said deposits without adversely affecting said surfaces comprising the steps of: contacting said surfaces containing said deposits with an aqueous ammoniacal cleaning solution consisting essentially of one or more alkali metal or ammonium perborate oxidizing agents; and removing said cleaning solution from contact with said surfaces after said deposits have dissolved therein.
Claim 11
Dependent Claim
12 words
The method of claim 7 wherein said oxidizing agent is sodium perborate.
Claim 12
Dependent Claim
18 words
The method of claim 8 wherein said aqueous ammoniacal solution further consists essentially of ammonia and ammonium bicarbonate.
Claim 13
Dependent Claim
84 words
The method of claim 9 wherein said ammonia is present in said solution in an amount in the range of from about 0.05% to about 15% by weight of said solution, said ammonium bicarbonate is present in said solution in an amount in the range of from about 0.04% to about 10% by weight of said solution and said sodium perborate is present in said solution in an amount in the range of from about 0.05% to about 5% by weight of said solution.
Claim 14
Dependent Claim
63 words
The method of claim 9 wherein said ammonia is present in said solution in an amount of about 9.7% by weight of said solution, said ammonium bicarbonate is present in said solution in an amount of about 10% by weight of said solution, and said sodium perborate is present in said solution in an amount of about 1% by weight of said solution.
Claim 15
Dependent Claim
104 words
A cleaning solution for removing copper and copper oxides from metal surfaces formed of austenitic or nickel-chromium alloys without adversely affecting said surfaces consisting essentially of water; ammonia present in said solution in an amount in the range of from about 0.05% to about 15% by weight of said solution; ammonium bicarbonate present in said solution in the range of from about 0.04% to about 10% by weight of said solution; and one or more alkali metal or ammonium perborate oxidizing agents present in said solution in an amount in the range of from about 0.05% to about 5% by weight of said solution.
Claim 16
Dependent Claim
104 words
A cleaning solution for removing copper and copper oxides from metal surfaces formed of austenitic or nickel-chromium alloys without adversely affecting said surfaces consisting essentially of water; ammonia present in said solution in an amount in the range of from about 0.05% to about 15% by weight of said solution; ammonium bicarbonate present in said solution in the range of from about 0.04% to about 10% by weight of said solution; and one or more alkali metal or ammonium perborate oxidizing agents present in said solution in an amount in the range of from about 0.05% to about 5% by weight of said solution.
Claim 17
Dependent Claim
13 words
The cleaning solution of claim 12 wherein said oxidizing agent is sodium perborate.
Claim 18
Dependent Claim
64 words
The cleaning solution of claim 13 wherein said ammonia is present in said solution in an amount of about 9.7% by weight of said solution, said ammonium bicarbonate is present in said solution in an amount of about 10% by weight of said solution, and said sodium perborate is present in said solution in an amount of about 1% by weight of said solution.
Claim 19
Dependent Claim
15 words
The cleaning solution of claim 14 wherein the pH of said solution is about 10.5.
References Cited (Backward Citations)
US780293A
Cited
US2567835A
Cited
US3034851A
Cited
US3000767A
Cited
US3460989A
Cited
US3664870A
Cited
US3738867A
Cited
US4452643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |