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Patent US3699207A successfully refreshed from Google Patents.
US3699207A
Expired / Lapsed
US
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Process for the purification of cadmium solutions
Assignee: Bayer AG
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Filing: 1970-05-27
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Granted: 1972-10-17
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Expires: 1990-05-27
Abstract
Abstract Process for producing cadmium solutions wherein said solution is contacted with a cation exchanger containing amino carboxylic- or imino carboxylic acid groups and wherein the ion exchanger is separated from the cadmium solution after having absorbed accompanying metals from said cadmium solution.
Inventors
- 👤 Wilhelm Roever
- 👤 Helmut Junghanss
- 👤 Hans-Werner Kauczor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:11
CPC Classifications
C; C22; C22B; C22B17/00; C22B17/04; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
The process of claim 1 wherein the cation exchange resin, following said contact, is eluted and the eluate is recovered.
Claim 2
Dependent Claim
22 words
The process of claim 1 wherein the carboxylic acid moiety of said active exchange groups contains from one to five carbon atoms.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein said cation exchange resin comprises a crosslinked polymer of a monomer having at least one olefinic double bond, said polymer having said aminocarboxylic or iminocarboxylic groups thereon as substituents.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the temperature of said aqueous cadmium solution is from 60* to 80*C.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein each liter of cation exchange resin volume is contacted with from 2 to 25 liters of aqueous cadmium solution per hour.
Claim 6
Dependent Claim
27 words
The process of claim 1 wherein each liter of cation exchange resin volume is contacted with from 4 to 10 liters of aqueous cadmium solution per hour.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |