Patent US2905602A successfully refreshed from Google Patents.
US2905602A
Expired / Lapsed
US
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Production of metal electrodeposits
Assignee: Dehydag Deutsche Hydrierwerke GmbH
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Filing: 1955-11-02
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Granted: 1959-09-22
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Expires: 1975-11-02
Abstract
No abstract record available.
Inventors
- 👤 Kirstahler Alfred
- 👤 Willmund Wolf-Dieter
- 👤 Strauss Wennemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:47
CPC Classifications
A; A21; A21D; A21D2/00; A21D2/08; A21D2/30; A21D2/32; C; C25; C25D; C25D3/00; C25D3/02; C25D3/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A PROCESS OF PRODUCING BRIGHT METAL ELECTRODEPOSITS OF METALS SELECTED FROM THE GROUP CONSISTING OF COPPER, ZINC, NICKEL, CHROMIUM AND PRECIOUS METALS FROM ACIDIC ELECTROPLATING BATHS CONTAINING IMPURITIES FOUND IN HARD WATER AND IN TECHNICAL GRADEMETAL SALTS, AND CONTAINING A BRIGHTENING AGENT WHOSE BRIGHTENING POWER IS ADVERSELY AFFECTED BY THE PRESENCE OF SUCH IMPURITIES, THE STEP WHICH COMPRISES ADDING TO SUCH ELECTROPLATING BATHS 0.001 TO 20GM. PER LITER OF A QUATERNARY AMMONIUM COMPOUND HAVING THE GENERAL STRUCTURAL FORMULA
Claim 2
Dependent Claim
79 words
IN A PROCESS OF PRODUCING BRIGHT METAL ELECTRODEPOSITS OF METALS SELECTED FROM THE GROUP CONSISTING OF COPPER, ZINC, NICKEL, CHROMIUM AND PRECIOUS METALS FROM ACIDIC ELECTROPLATING BATHS CONTAINING IMPURITIES FOUND IN HARD WATER AND IN TECHNICAL GRADEMETAL SALTS, AND CONTAINING A BRIGHTENING AGENT WHOSE BRIGHTENING POWER IS ADVERSELY AFFECTED BY THE PRESENCE OF SUCH IMPURITIES, THE STEP WHICH COMPRISES ADDING TO SUCH ELECTROPLATING BATHS 0.001 TO 20GM. PER LITER OF A QUATERNARY AMMONIUM COMPOUND HAVING THE GENERAL STRUCTURAL FORMULA
References Cited (Backward Citations)
US2707166A
Cited
US2663684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |