Patent US3902978A successfully refreshed from Google Patents.
US3902978A
Expired / Lapsed
US
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Electroplating bath for preparation of glossy rhodium coating
Assignee: Evonik Operations GmbH
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Filing: 1974-04-09
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Granted: 1975-09-02
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Expires: 1994-04-09
Abstract
Abstract There is provided a bath for the electroplating of a glossy rhodium coating which bath contains rhodium sulfate or rhodium phosphate, free acid and at least 50 mg/liter of chloride in the form of a chloride of main groups I and II of the periodic system or aluminum chloride or chromium III chloride.
Inventors
- 👤 Wolfgang Zilske
- 👤 Wolfgang Engelhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:15
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
AN AQUEOUS BATH SUITABLE FOR THE ELECTROPLATING OF GLOSSY RHODIUM COATINGS, SAID BATH CONTAINING EITHER (A) 2 TO 10 GRAMS/LITE OF RHODIUM PHOSPHATE AND 10 TO 40 GRAMS/LITER OF PHOSPHORIC ACID OR (B) 2 TO 10 GRAMS/LITER OF RHODIUM SULFATE AND 20 TO 60 GRAMS/LITER OF SULFURIC ACID AND AT LEAST 50 MG/LITER OF A CHLORIDE IN THE FORM OF A METAL CHLORIDE OR MAIN GROUP 11 OF THE PERIODIC SYSTEM, LITHIUM CHLORIDE, ALUMINUM CHLORIDE OR CHROMIUM (111) CHLORIDE
Claim 2
Dependent Claim
79 words
AN AQUEOUS BATH SUITABLE FOR THE ELECTROPLATING OF GLOSSY RHODIUM COATINGS, SAID BATH CONTAINING EITHER (A) 2 TO 10 GRAMS/LITE OF RHODIUM PHOSPHATE AND 10 TO 40 GRAMS/LITER OF PHOSPHORIC ACID OR (B) 2 TO 10 GRAMS/LITER OF RHODIUM SULFATE AND 20 TO 60 GRAMS/LITER OF SULFURIC ACID AND AT LEAST 50 MG/LITER OF A CHLORIDE IN THE FORM OF A METAL CHLORIDE OR MAIN GROUP 11 OF THE PERIODIC SYSTEM, LITHIUM CHLORIDE, ALUMINUM CHLORIDE OR CHROMIUM (111) CHLORIDE
Claim 3
Dependent Claim
17 words
A bath according to claim 1 wherein the amount of chloride is between 0.1 and 5 grams/liter.
Claim 4
Dependent Claim
9 words
A bath according to claim 2 containing lithium chloride.
Claim 5
Dependent Claim
9 words
A bath according to claim 2 containing magnesium chloride.
Claim 6
Dependent Claim
63 words
An aqueous bath according to claim 1 suitable for the electroplating of glossy rhodium coatings, said bath containing (1) either 2 to 10 grams/liter of rhodium phosphate and 10 to 40 grams/liter of phosphoric acid or 2 to 10 grams/liter of rhodium sulfate and 20 to 60 grams/liter of sulfuric acid and (2) at least 50 mg/liter of lithium chloride or magnesium chloride.
Claim 7
Dependent Claim
52 words
An aqueous bath according to claim 5, containing (1) 2 to 10 grams/liter of rhodium phosphate and 10 to 40 grams/liter of phosphoric acid or 2 to 10 grams/liter of rhodium sulfate and 20 to 60 grams/liter of sulfuric acid and (2) 0.1 to 5 grams/liter of lithium chloride or magnesium chloride.
Claim 8
Dependent Claim
28 words
An aqueous bath according to claim 6 containing 2 grams/liter of rhodium as rhodium sulfate, 40 grams/liter of sulfuric acid and 1 gram/liter of chloride as magnesium chloride.
Claim 9
Dependent Claim
15 words
A bath according to claim 1 wherein the chloride is lithium chloride or magnesium chloride.
Claim 10
Dependent Claim
19 words
A bath according to claim 1 wherein the chloride is a metal chloride of a main group II metal.
Claim 11
Dependent Claim
13 words
A bath according to claim 1 wherein the chloride is chromium (III) chloride.
Claim 12
Dependent Claim
12 words
A bath according to claim 1 wherein the chloride is aluminum chloride.
Claim 13
Dependent Claim
18 words
A bath according to claim 1 wherein the amount of chloride is from 50 mg/liter to 10 grams/liter.
References Cited (Backward Citations)
US1949131A
Cited
US2461933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |