US2848399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrowinning of zinc
Assignee: American Zinc Lead and Smelting Co
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Filing: 1955-06-06
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Granted: 1958-08-19
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Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 Leslie D Mcgraw
- 👤 Garson A Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:24
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A PROCESS FOR ELECTROWINNING ZINC BY ELECTROLYZING AN ACIDIC AQUEOUS SOLUTION OF ZINC CONTAINING DISSOLVED MANGANESE, EMPLOYING AN ANODE OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF LEAD AND LEAD-BASE ALLOYS, A METHOD OF DENSIFYING ANODE SCALE AND CAUSING A SUBSTANTIAL PORTION OF SAID SCALE TO ADHERE TO SAID ANODE THAT COMPRISES MAINTAINING IN SAID SOLUTION ABOUT 0.01 TO 0.1 GRAM PER LITER OF AN AROMATIC SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF THE BENZENE AND NAPHTHALENE SULFONIC ACIDS, ALKYL SUBSTITUTED BENZENE AND NAPHNAPHTHALENE SULFONIC ACIDS, AND HALOGENATED DERIVATIVES THEREOF.
Claim 2
Dependent Claim
93 words
IN A PROCESS FOR ELECTROWINNING ZINC BY ELECTROLYZING AN ACIDIC AQUEOUS SOLUTION OF ZINC CONTAINING DISSOLVED MANGANESE, EMPLOYING AN ANODE OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF LEAD AND LEAD-BASE ALLOYS, A METHOD OF DENSIFYING ANODE SCALE AND CAUSING A SUBSTANTIAL PORTION OF SAID SCALE TO ADHERE TO SAID ANODE THAT COMPRISES MAINTAINING IN SAID SOLUTION ABOUT 0.01 TO 0.1 GRAM PER LITER OF AN AROMATIC SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF THE BENZENE AND NAPHTHALENE SULFONIC ACIDS, ALKYL SUBSTITUTED BENZENE AND NAPHNAPHTHALENE SULFONIC ACIDS, AND HALOGENATED DERIVATIVES THEREOF.
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 |