US3661734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonate removal
Assignee: Remington Arms Co LLC
•
Filing: 1970-07-02
•
Granted: 1972-05-09
•
Expires: 1990-07-02
Abstract
Abstract Removal of carbonate ions from cyanide-containing electroplating baths, or bath rinse solutions by contacting with an acid ion exchange resin, and liberating the carbon dioxide formed as off gas.
Inventors
- 👤 Walter John Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:19
CPC Classifications
C; C25; C25D; C25D21/00; C25D21/16; C25D21/22; B; B01; B01J; B01J39/00; B01J39/04; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
A process for removal of carbonate ions from cyanide-containing electroplating bath or bath rinse solutions according to claim 1 in which said solutions are flowed upwardly through said cation exchanger.
Claim 2
Dependent Claim
56 words
A process for removal of carbonate ions from cyanide-containing electroplating bath or bath rinse solutions according to claim 1 in which the said solution which has been contacted with said hydrogen form of a cation resin is mixed with said solution which has not been ion-exchange pH treated, to obtain a recycle solution of preselected pH.
Claim 3
Dependent Claim
42 words
A process for removal of carbonate ions from cyanide-containing electroplating bath or bath rinse solutions according to claim 1 wherein said hydrogen form of said cation exchanger is partially neutralized prior to said contacting with said solutions as provided in step (1).
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |