US2848487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of cadmium from a residue obtained in the manufacture of terephthalic acid
Assignee: Hercules Powder Co
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Filing: 1956-07-16
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Granted: 1958-08-19
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Expires: 1976-07-16
Abstract
No abstract record available.
Inventors
- 👤 Robert T Keen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:31
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/92; C; C07; C07C; C07C51/00; C07C51/41; C07C51/416; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN THE MANUFACTURE OF AN AROMATIC DICARBOXYLIC ACID WHEREIN A MONOVALENT METAL SALT OF ANOTHER AROMATIC CARBOXYLIC ACID IS HEATED IN THE PRESENCE OF A CADMIUM CATALYST TO FORM THE CORRESPONDING MONOVALENT METAL SALT OF THE DESIRED AROMATIC DICARBOXYLIC ACID AND THE REACTION PRODUCT IS EXTRACTED WITH WATER LEAVING A WATER-INSOLUBLE RESIDUE CONTAINING CADMIUM, THE METHOD OF RECOVERING CADMIUM FROM SAID RESIDUE WHICH COMPRISES CONTACTING THE RESIDUE WITH NITRIC ACID TO DISSOLVE THE CADMIUM PRESENT THEREIN.
Claim 2
Dependent Claim
76 words
IN THE MANUFACTURE OF AN AROMATIC DICARBOXYLIC ACID WHEREIN A MONOVALENT METAL SALT OF ANOTHER AROMATIC CARBOXYLIC ACID IS HEATED IN THE PRESENCE OF A CADMIUM CATALYST TO FORM THE CORRESPONDING MONOVALENT METAL SALT OF THE DESIRED AROMATIC DICARBOXYLIC ACID AND THE REACTION PRODUCT IS EXTRACTED WITH WATER LEAVING A WATER-INSOLUBLE RESIDUE CONTAINING CADMIUM, THE METHOD OF RECOVERING CADMIUM FROM SAID RESIDUE WHICH COMPRISES CONTACTING THE RESIDUE WITH NITRIC ACID TO DISSOLVE THE CADMIUM PRESENT THEREIN.
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |