Patent US3706635A successfully refreshed from Google Patents.
US3706635A
Expired / Lapsed
US
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Electrochemical compositions and processes
Assignee: Monsanto Co
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Filing: 1971-11-15
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Granted: 1972-12-19
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Expires: 1991-11-15
Abstract
Abstract An electrically conductive medium for the electrodeposition of metals is described which comprises an aqueous solution of a composition comprising (1) a complex consisting of a metal ion and an ethylenediamine tetra(methylene phosphonate) ligand, and (2) a complex consisting of a metal ion and a 1-hydroxy, ethylidene-1,1-diphosphonate liquid.
Inventors
- 👤 Xavier Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:48
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
The process as set forth in claim 1 wherein the metal ion is a transitional metal ion selected from the group consisting of gold, copper, iron, nickel, zinc and cadmium ions.
Claim 2
Dependent Claim
18 words
The process as set forth in claim 1 wherein such methylene phosphonate ligand is ethylenediamine tetra(methylene phosphonic acid).
Claim 3
Dependent Claim
16 words
The process as set forth in claim 1 wherein such diphosphonate ligand is 1-hydroxy, ethylidene-1,1-diphosphonic acid.
Claim 4
Dependent Claim
29 words
The process as set forth in claim 1 wherein said solution is maintained at a temperature of from about 40*C to about 80*C during the electrodeposition of said metal.
Claim 5
Dependent Claim
131 words
A galvanic bath useful for the preparation of galvanic metal deposits which comprises a substantially cyanide - free aqueous soLution having a pH of from about 6.0 to about 13.0 which contains a composition comprising (1) a complex consisting of a metal ion and an ethylenediamine tetra (methylene phosphonate) ligand and (2) a complex consisting of a metal ion and a 1-hydroxy, ethylidene-1, 1-diphosphonate ligand; wherein said composition is present in said solution in an amount sufficient to provide from about 0.1 percent to about 5 percent by weight, based on the weight of said solution, of said metal and wherein said diphosphonate to metal ion mol ratio is from about 1.0:1 to about 4.0:1, and said methylene phosphonate to metal ion mol ratio is from about 0.1:1 to about 1.0:1.
Claim 6
Dependent Claim
18 words
The bath as set forth in claim 6 wherein said methylene phosphonate ligand is ethylenediamine tetra(methylene phosphonic acid).
Claim 7
Dependent Claim
16 words
The bath as set forth in claim 6 wherein said diphosphonate ligand is 1-hydroxy, ethylidene-1,1-diphosphonic acid.
Claim 8
Dependent Claim
31 words
The bath as set forth in claim 6 wherein the metal ion is a transitional metal ion selected from the group consisting of gold, copper, iron, nickel, zinc and cadmium ions.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |