US3793172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes and baths for electro-stripping plated metal deposits from articles
Assignee: AT&T Inc
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Filing: 1972-09-01
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Granted: 1974-02-19
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Expires: 1992-09-01
Abstract
Abstract An electrolytic stripping bath and process that are ideally suited for stripping a large number of different types of plated metal deposits, singularly, in selective combinations, or in the form of selective alloys thereof, from a base metal, such as titanium, forming an article. The bath does not attack or otherwise adversely affect the exposed surface of the base metal, and with the bath being operated at ambient temperature, evaporation of the bath constituents and the generation of fumes during an electrochemical stripping operation are minimized.
Inventors
- 👤 C Cadieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:16
CPC Classifications
C; C25; C25F; C25F5/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
The process of electro-stripping in accordance with claim 1 wherein the concentration of said fluoboric acid in said electrolytic bath is between 28 and 32 percent, by weight, and wherein the concentration of said phosphoric acid in said bath is between 10 and 15 percent, by weight.
Claim 2
Dependent Claim
116 words
The process of electro-stripping singularly and in selective combinations deposited metals, selected from the group consisting of copper, nickel, chromium, brass, tin, lead, zinc, gold and silver, from the surface of articles having base metals selected from the group consisting of titanium and tantalum, which comprises the steps of: immersing the plated article in an electrolytic bath consisting essentially, by weight, of an aqueous solution of 25 to 35 percent fluoboric acid, 10 to 20 percent phosphoric acid, and the remainder of 45 to 65 percent being mainly of water, and applying an electric current from the article, as anode, through the bath to a cathode until the plated metal has been electro-stripped from the article.
Claim 3
Dependent Claim
44 words
The process of electro-stripping in accordance with claim 3 wherein the concentration of said fluoboric acid in said electrolytic bath is approximately 29 percent, by weight, and wherein said phosphoric acid in said bath is approximately 13 percent, by weight, with the remainder water.
Claim 4
Dependent Claim
128 words
The process of electro-stripping singularly and in selective combinations electro-deposited metals, selected from the group consisting of copper, nickel, chromium, brass, tin, lead, zinc, gold and silver, from such plated articles having base metals selected from the group consisting of titanium and tantalum, which comprises the steps of: immersing the plated article in an electrolytic bath consisting essentially, by volume, of an aqueous solution the equivalent of 50 to 60 percent of a 39.9* BAUME'' fluoboric acid, the equivalent of 12 to 17 percent of a 53.2* BAUME'' phosphoric acid, and from 23 to 33 percent water, and applying an electric current from the article, as anode, through the bath to a cathode until the plated metal has been electro-stripped from the article and disintegrates into the solution.
Claim 5
Dependent Claim
70 words
An electrolytic bath for stripping plated metals from a different base metal, consisting essentially of fluoboric acid, phosphoric acid and water, wherein the concentration of said fluoboric acid in said bath is between 20 and 40 percent, by weight, and wherein said phospHoric acid in said bath is between 5 and 25 percent, by weight, with the remainder of between 35 and 75 percent, by weight, being mainly of water.
Claim 6
Dependent Claim
57 words
An electrolytic bath in accordance with claim 6 wherein the concentration of said fluoboric acid in said bath is between 28 and 30 percent, by weight, and wherein said phosphoric acid in said bath is between 12 and 14 percent, by weight, with the remainder of between 56 and 60 percent, by weight, being mainly of water.
Claim 7
Dependent Claim
52 words
An electrolytic solution for stripping metals from a different base metal consisting essentially, by volume, of an aqueous mixture the equivalent of 50 to 60 percent of a 39.9* BAUME'' fluoboric acid, the equivalent of 12 to 17 percent of a 53.2* BAUME'' phosphoric acid, and from 23 to 33 percent water.
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |