US2800439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright metal plating
Assignee: Evonik Operations GmbH
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Filing: 1955-06-23
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Granted: 1957-07-23
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Expires: 1975-06-23
Abstract
No abstract record available.
Inventors
- 👤 Fischer Johannes
- 👤 Schwarze Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:02
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/46; C25D3/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD OF ELECTROPLATING A METAL SELECTED FROM THE GROUP CONSISTING OF GOLD, SILVER AND GOLD-SILVER ALLOYS ON A BASE MEMBER WHICH COMPRISES ELECTROPLATING THE BASE MEMBER IN A ELECTROPLATING BATH COMPRISING AN AQUEOUS CYANIDE SOLUTION OF A SALT OF THE SELECTED METAL AND CONTAINING AS A BRIGHTENER A CONDENSATION PRODUCT OF AN UNSATURATED ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF ACROLEIN AND ITS ALPHA SUBSTITUTION PRODUCTS AND A COMPOUND WITH A GROUP S>C=S SELECTED FROM THE GFROUP CONSISTING OF CARBON DISULFIDE AND ALKALI METAL XANTHATE IN AN AMOUNT SUFFICIENT TO IMPART BRIGHTNESS TO THE ELECTRO-DEPOSITED METAL.
Claim 2
Independent Claim
97 words
A METHOD OF ELECTROPLATING A METAL SELECTED FROM THE GROUP CONSISTING OF GOLD, SILVER AND GOLD-SILVER ALLOYS ON A BASE MEMBER WHICH COMPRISES ELECTROPLATING THE BASE MEMBER IN A ELECTROPLATING BATH COMPRISING AN AQUEOUS CYANIDE SOLUTION OF A SALT OF THE SELECTED METAL AND CONTAINING AS A BRIGHTENER A CONDENSATION PRODUCT OF AN UNSATURATED ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF ACROLEIN AND ITS ALPHA SUBSTITUTION PRODUCTS AND A COMPOUND WITH A GROUP S>C=S SELECTED FROM THE GFROUP CONSISTING OF CARBON DISULFIDE AND ALKALI METAL XANTHATE IN AN AMOUNT SUFFICIENT TO IMPART BRIGHTNESS TO THE ELECTRO-DEPOSITED METAL.
References Cited (Backward Citations)
US2666738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |