Patent US2495668A successfully refreshed from Google Patents.
US2495668A
Expired / Lapsed
US
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Electrodeposition of copper
Assignee: Harshaw Chemical Co
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Filing: 1946-12-21
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Granted: 1950-01-24
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Expires: 1966-12-21
Abstract
No abstract record available.
Inventors
- 👤 Karl S Willson
- 👤 David G Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:55
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/38; C25D3/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
AN AQUEOUS, ALKALINE ELECTROPLATING BATH WHICH COMPRISES AN AQUEOUS MEDIUM TO WHICH HAS BEEN ADDED A METAL ION YIELDING MATERIAL ESSENTIALLY CONSISTING OF COPPER CYANIDE IN CONCENTRATION FROM 30 TO 150 GRAMS PER LITER, A SUFFICIENT AMOUNT OF SODIUM CYANIDE TO PRODUCE FROM 2 TO 12 GRAMS PER LITER OF FREE CYANIDE IN THE SOLUTION AND AN AMOUNT OF A BRIGHTENING ADDITION AGENT OF THE CLASS CONSISTING OF B-MERCAPTO ETHANOL, DITHIODIGLYCOL, B,B'' DIHYDROXYETHYL SULFIDE AND THIOGLYCOLLIC ACID SUFFICIENT TO PERMIT A BRILLIANT CATHODIC DEPOSIT OF COPPER UPON THE PASSAGE OF AN ELECTRIC CURRENT FROM A COPPER ANODE TO A CATHODE THROUGH THE BATH, THE CONCENTRATION OF SAID BRIGHTENING ADDITION AGENT BEING FROM 0.05 GRAM PER LITER TO 10 GRAMS PER LITER IN THE CASE OF B-MERCAPTO ETHANOL, FROM 0.04 GRAM PER LITER TO 1.8 GRAMS PER LITER IN THE CASE OF DITHIODIGLYCOL, FROM 0.007 GRAM PER LITER TO 35 GRAMS PER LITER IN THE CASE OF THIOGLYCOLLIC ACID, AND FROM 1 GRAM PER LITER TO 240 GRAMS PER LITER IN THE CASE OF B,B'' DIHYDROXYETHYL SULFIDE.
Claim 2
Dependent Claim
176 words
AN AQUEOUS, ALKALINE ELECTROPLATING BATH WHICH COMPRISES AN AQUEOUS MEDIUM TO WHICH HAS BEEN ADDED A METAL ION YIELDING MATERIAL ESSENTIALLY CONSISTING OF COPPER CYANIDE IN CONCENTRATION FROM 30 TO 150 GRAMS PER LITER, A SUFFICIENT AMOUNT OF SODIUM CYANIDE TO PRODUCE FROM 2 TO 12 GRAMS PER LITER OF FREE CYANIDE IN THE SOLUTION AND AN AMOUNT OF A BRIGHTENING ADDITION AGENT OF THE CLASS CONSISTING OF B-MERCAPTO ETHANOL, DITHIODIGLYCOL, B,B'' DIHYDROXYETHYL SULFIDE AND THIOGLYCOLLIC ACID SUFFICIENT TO PERMIT A BRILLIANT CATHODIC DEPOSIT OF COPPER UPON THE PASSAGE OF AN ELECTRIC CURRENT FROM A COPPER ANODE TO A CATHODE THROUGH THE BATH, THE CONCENTRATION OF SAID BRIGHTENING ADDITION AGENT BEING FROM 0.05 GRAM PER LITER TO 10 GRAMS PER LITER IN THE CASE OF B-MERCAPTO ETHANOL, FROM 0.04 GRAM PER LITER TO 1.8 GRAMS PER LITER IN THE CASE OF DITHIODIGLYCOL, FROM 0.007 GRAM PER LITER TO 35 GRAMS PER LITER IN THE CASE OF THIOGLYCOLLIC ACID, AND FROM 1 GRAM PER LITER TO 240 GRAMS PER LITER IN THE CASE OF B,B'' DIHYDROXYETHYL SULFIDE.
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) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |