US2609339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright copper plating from cyanide baths
Assignee: United Chromium Inc
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Filing: 1948-11-02
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Granted: 1952-09-02
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Expires: 1968-11-02
Abstract
No abstract record available.
Inventors
- 👤 Passal Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:22
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/38; C25D3/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
AN AQUEOUS CYANIDE TYPE OF BATH FOR ELECTROPLATING COPPER HAVING AS ITS ESSENTIAL CONSTITUENTS CU-20 TO 55 GRAMS PER LITER, FREE KCN-5 TO 13 GRAMS PER LITER, KOH-7.5 TO 30 GRAMS PER LITER, AND 0.005 TO 1 GRAM PER LITER OF A BRIGHTENER ADDITION HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2347448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |