US3859149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for etching aluminium alloys
Assignee: Rolls Royce PLC
•
Filing: 1974-06-13
•
Granted: 1975-01-07
•
Expires: 1994-06-13
Abstract
Abstract An etching solution for etching aluminium alloys which contain copper comprises an aqueous solution of copper ions, together with a source of hydrogen ions and nitrate ions. The normality of the nitrate ions is arranged such that it is less than the normality of the hydrogen ions.
Inventors
- 👤 Christopher John Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:20
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A METHOD OF ETCHING AN ALUMINUM ALLOY WHICH CONTAINS COPPER COMPRISING TREATING THE SURFACE OF SAID ALLOY WITH AN AQUEOUS SOLUTION CONTAINING COPPER IONS, HYDROGEN IONS AND NITRATE IONS, THE CONCENTRATION OF SAID COPPER IONS BEING WITHIN THE RANGE 0.5 TO 100 GRAMS PER LITRE, THE CONCENTRATION OF SAID HYDROGEN IONS BEING WITHIN THE RANGE 1.5 TO 6.0 NORMAL AND THE CONCENTRATION OF SAID NITRATE IONS BEING WITHIN THE RANGE 0.5 TO 5.0 NORMAL, THE NORMALITY OF SAID NITRATE IONS BEING ARRANGED SUCH THAT IT IS LESS THAN THE NORMALITY OF SAID HYDROGEN IONS.
Claim 2
Independent Claim
94 words
A METHOD OF ETCHING AN ALUMINUM ALLOY WHICH CONTAINS COPPER COMPRISING TREATING THE SURFACE OF SAID ALLOY WITH AN AQUEOUS SOLUTION CONTAINING COPPER IONS, HYDROGEN IONS AND NITRATE IONS, THE CONCENTRATION OF SAID COPPER IONS BEING WITHIN THE RANGE 0.5 TO 100 GRAMS PER LITRE, THE CONCENTRATION OF SAID HYDROGEN IONS BEING WITHIN THE RANGE 1.5 TO 6.0 NORMAL AND THE CONCENTRATION OF SAID NITRATE IONS BEING WITHIN THE RANGE 0.5 TO 5.0 NORMAL, THE NORMALITY OF SAID NITRATE IONS BEING ARRANGED SUCH THAT IT IS LESS THAN THE NORMALITY OF SAID HYDROGEN IONS.
Claim 3
Dependent Claim
73 words
A method of etching as claimed in claim 1 wherein after said alloy surface has been treated with said etching solution, it is rinsed with water, treated with dilute aqueous nitric acid solution in order to substantially remove any copper deposited thereon, rinsed for a second time with water, treated with a dilute sodium hydroxide solution in order to substantially remove any porosity thereon and finally rinsed for a third time with water.
Claim 4
Dependent Claim
25 words
A method of etching as claimed in claim 2 wherein a 10% aqueous nitric acid solution is used for removing said any deposited copper layer.
Claim 5
Dependent Claim
24 words
A method of etching as claimed in claim 2 wherein a 15% aqueous sodium hydroxide solution is used for substantially removing said any porosity.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |