US4244833A
Expired / Lapsed
US
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Composition and process for chemically stripping metallic deposits
Assignee: Occidental Chemical Corp
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Filing: 1979-11-15
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Granted: 1981-01-13
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Expires: 1999-11-15
Abstract
Abstract An improved process and composition for chemically stripping metallic deposits from a substrate, and particularly, from the contact tips of electroplating racks and like apparatus to maintain proper operating efficiency thereof. The improved composition and method employs an aqueous acidic solution containing nitric acid, chloride ions and manganous ions present in an amount sufficient to accelerate the initiation of and the rate of stripping of the metallic deposits. The method and composition are applicable for chemically stripping a variety of metallic deposits at stripping rates substantially higher than those heretofore attainable with prior art compositions and techniques.
Inventors
- 👤 Lillie C. Tomaszewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:59
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/44
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
40 words
A composition for chemically stripping metallic deposits from a substrate comprising an aqueous acidic solution containing nitric acid, chloride ions and manganous ions present in an amount sufficient to accelerate the initiation and rate of stripping of the metallic deposit.
Claim 2
Dependent Claim
40 words
A composition for chemically stripping metallic deposits from a substrate comprising an aqueous acidic solution containing nitric acid, chloride ions and manganous ions present in an amount sufficient to accelerate the initiation and rate of stripping of the metallic deposit.
Claim 3
Dependent Claim
11 words
The composition as defined in claim 1 further containing ferrous ions.
Claim 4
Dependent Claim
11 words
The composition as defined in claim 1 further containing cupric ions.
Claim 5
Dependent Claim
11 words
The composition as defined in claim 1 further containing nickel ions.
Claim 6
Dependent Claim
16 words
The composition as defined in claim 1 containing about 235 to about 1050 g/l nitric acid.
Claim 7
Dependent Claim
16 words
The composition as defined in claim 1 containing about 490 to about 900 g/l nitric acid.
Claim 8
Dependent Claim
16 words
The composition as defined in claim 1 containing about 0.2 to about 10 g/l manganous ions.
Claim 9
Dependent Claim
16 words
The composition as defined in claim 1 containing about 0.5 to about 3 g/l manganous ions.
Claim 10
Dependent Claim
16 words
The composition as defined in claim 1 containing about 0.2 g/l chloride ions up to saturation.
Claim 11
Dependent Claim
16 words
The composition as defined in claim 1 containing about 0.5 to about 10 g/l chloride ions.
Claim 12
Dependent Claim
17 words
The composition as defined in claim 1 further containing about 0.2 to about 10 g/l cupric ions.
Claim 13
Dependent Claim
17 words
The composition as defined in claim 1 further containing about 0.2 to about 10 g/l ferrous ions.
Claim 14
Dependent Claim
17 words
The composition as defined in claim 1 further containing about 0.5 to about 3 g/l ferrous ions.
Claim 15
Dependent Claim
17 words
The composition as defined in claim 1 further containing about 0.2 to about 10 g/l nickel ions.
Claim 16
Independent Claim
81 words
A method for chemically stripping metallic deposits from a substrate comprising the steps of contacting the metallic deposit to be stripped with an aqueous acidic solution at a temperature of about 60° F. containing nitric acid, chloride ions, and manganous ions present in an amount sufficient to accelerate the initiation and rate of stripping of the metallic deposit, and continuing the contact of said solution with said deposit for a period of time to effect the desired magnitude of stripping thereof.
Claim 17
Independent Claim
81 words
A method for chemically stripping metallic deposits from a substrate comprising the steps of contacting the metallic deposit to be stripped with an aqueous acidic solution at a temperature of about 60° F. containing nitric acid, chloride ions, and manganous ions present in an amount sufficient to accelerate the initiation and rate of stripping of the metallic deposit, and continuing the contact of said solution with said deposit for a period of time to effect the desired magnitude of stripping thereof.
Claim 18
Dependent Claim
24 words
The method as defined in claim 15 in which said nitric acid is present in an amount of about 235 to about 1050 g/l.
Claim 19
Dependent Claim
24 words
The method as defined in claim 15 in which said manganous ions are present in an amount of about 0.2 to about 10 g/l.
Claim 20
Dependent Claim
24 words
The method as defined in claim 15 in which said chloride ions are present in an amount of about 0.2 g/l up to saturation.
Claim 21
Dependent Claim
27 words
The method as defined in claim 15 in which said solution further contains cupric ions in an amount sufficient to enhance the stripping action of said solution.
Claim 22
Dependent Claim
27 words
The method as defined in claim 15 in which said solution further contains ferrous ions in an amount sufficient to enhance the stripping action of said solution.
Claim 23
Dependent Claim
24 words
The method as defined in claim 19 in which said cupric ions are present in an amount of about 0.2 to about 10 g/l.
Claim 24
Dependent Claim
24 words
The method as defined in claim 20 in which said ferrous ions are present in an amount of about 0.2 to about 10 g/l.
Claim 25
Dependent Claim
37 words
The method as defined in claim 13 in which said metallic deposit comprises a metal selected from the group consisting of copper, bright nickel, sulfur-free nickel, nickel-iron alloys, nickel-phosphorous alloys, chromium, brass, tin, cadmium, zinc and rhodium.
Claim 26
Dependent Claim
27 words
The method as defined in claim 15 in which said solution further contains nickel ions in an amount sufficient to enhance the stripping action of said solution.
Claim 27
Dependent Claim
24 words
The method as defined in claim 24 in which said nickel ions are present in an amount of about 0.2 to about 10 g/l.
Claim 28
Dependent Claim
66 words
The method as defined in claim 15 in which said solution contains about 235 to about 1050 g/l nitric acid, about 0.2 to about 10 g/l manganous ions, about 0.2 g/l up to saturation chloride ions, and further including a metal ion selected from the group consisting of cupric, ferrous, nickel and mixtures thereof present in an amount to enhance the stripping action of said solution.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |