Patent US3787554A successfully refreshed from Google Patents.
US3787554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of iridium and rhodium
Assignee: WC Heraus GmbH and Co KG
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Filing: 1972-08-02
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Granted: 1974-01-22
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Expires: 1992-08-02
Abstract
Abstract IRIDIUM IS SEPARATED FROM AQUEOUS MINERAL ACID SOLUTIONS CONTAINING IRIDIUM AND RHODIUM USING AN ORGANICALLY SUBSTITUTED AMMONIUM SALT AND EXTRACTING THE IRIDIUM COMPLEX THAT IS FORMED WITH AN ORGANIC SOLVENT, TRIALKYL AMMONIUM HALIDES ARE USED TO FORM THE IRIDIUM COMPLEX AND ALIPHATIC OR AROMATIC HALOGENATED HYDROCARBON, A CARBOXYLIC ACID ESTER OR A SLIGHTLY WATER-SOLUBLE ALCOHOL ARE USED TO EXTRACT THE IRIDIUM COMPLEX.
Inventors
- 👤 M Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:02
CPC Classifications
C; C01; C01G; C01G55/00; C01G55/001; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/262; C22B3/28; C22B3/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |