US2833703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of chromium from plating baths and electroplating process
Assignee: MacDermid Inc
•
Filing: 1957-11-13
•
Granted: 1958-05-06
•
Expires: 1977-11-13
Abstract
No abstract record available.
Inventors
- 👤 Laue Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:01
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/003; C25; C25D; C25D21/00; C25D21/16; C25D21/18; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR REMOVING TRIVALENT CHROMIUM CONTAMINANTS FROM A METAL CYANIDE PLATING BATH, WHICH COMPRISES ADDING THERETO A SUBSTITUTED ANTHRAQUINONE CAPABLE OF FORMING A CHROMIUM LAKE THEREIN SELECTED FROM THE GROUP CONSISTING OF 1,2-DIHYDROXY ANTHRAQUINONE, RING SUBSTITUTED 1,2-DIHYDROXY ANTHRAQUINONES AND MIXTURES THEREOF, CONTACTING THE THUS TREATED BATH WITH ACTIVATED CARBON AND THEN SEPARATING THE CARBON, CHROMIUM LAKE AND ADSORBED SUBSTITUTED ANTHRAQUINONE FROM THE BATH.
Claim 2
Dependent Claim
64 words
A PROCESS FOR REMOVING TRIVALENT CHROMIUM CONTAMINANTS FROM A METAL CYANIDE PLATING BATH, WHICH COMPRISES ADDING THERETO A SUBSTITUTED ANTHRAQUINONE CAPABLE OF FORMING A CHROMIUM LAKE THEREIN SELECTED FROM THE GROUP CONSISTING OF 1,2-DIHYDROXY ANTHRAQUINONE, RING SUBSTITUTED 1,2-DIHYDROXY ANTHRAQUINONES AND MIXTURES THEREOF, CONTACTING THE THUS TREATED BATH WITH ACTIVATED CARBON AND THEN SEPARATING THE CARBON, CHROMIUM LAKE AND ADSORBED SUBSTITUTED ANTHRAQUINONE FROM THE BATH.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |