US3294483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering palladium from acid solutions
Assignee: Hoechst AG
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Filing: 1964-10-02
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Granted: 1966-12-27
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Expires: 1984-10-02
Abstract
No abstract record available.
Inventors
- 👤 Hirschberg Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:33
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C01; C01G; C01G55/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR RECOVERING PALLADIUM AS AN INORGANIC CHLORIDE SALT IN A CONCENTRATED SOLUTION THEREOF, WHICH COMPRISES CONTACTING AN INORGANIC, ACIDIC, PALLADIUM CHLORIDE SALT SOLUTION WITH GASEOUS HYDROGEN AND A POROUS PACKING MATERIAL PLATINIZED BY IMPREGNATION WITH A PLATINUM CHLORIDE SOLUTION TO REDUCE THE SALT TO METALLIC PALLADIUM AND DEPOSIT THE PALLADIUM ON SAID PACKING MATERIAL AS A METAL AND THEN RECOVERING THE PALLADIUM THUS DEPOSITED BY DISSOLVING IT WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN OXIDIZING ACID AND A COMBINATION OF AN OXIDIZING AGENT AND A NONOXIDIZING ACID TO FORM A SOLUBLE SALT OF SAID ACID.
Claim 2
Dependent Claim
100 words
A PROCESS FOR RECOVERING PALLADIUM AS AN INORGANIC CHLORIDE SALT IN A CONCENTRATED SOLUTION THEREOF, WHICH COMPRISES CONTACTING AN INORGANIC, ACIDIC, PALLADIUM CHLORIDE SALT SOLUTION WITH GASEOUS HYDROGEN AND A POROUS PACKING MATERIAL PLATINIZED BY IMPREGNATION WITH A PLATINUM CHLORIDE SOLUTION TO REDUCE THE SALT TO METALLIC PALLADIUM AND DEPOSIT THE PALLADIUM ON SAID PACKING MATERIAL AS A METAL AND THEN RECOVERING THE PALLADIUM THUS DEPOSITED BY DISSOLVING IT WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN OXIDIZING ACID AND A COMBINATION OF AN OXIDIZING AGENT AND A NONOXIDIZING ACID TO FORM A SOLUBLE SALT OF SAID ACID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |