Patent US2673179A successfully refreshed from Google Patents.
US2673179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of zinc
Assignee: Individual
•
Filing: 1950-09-01
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Granted: 1954-03-23
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Expires: 1970-09-01
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Duncan
- 👤 Eustis Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:17
CPC Classifications
C; C25; C25C; C25C5/00; C25C5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
A PROCESS FOR THE PREPARATION OF ZINC POWDER FROM CHLORINE-CONTAINING ZINC-BEARING RAW MATERIALS HAVING PRESENT THEREIN FREE, METALLIC ZINC SELECTED FROM THE GROUP CONSISTING OF SAL SKIMMINGS, GALVANIZING SKIMMINGS AND ZINC ASH COMPRISING LEACHING THE ZINC-BEARING RAW MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING DISSOLVED CHLORINE AND SODIUM CHLORIDE TO CONVERT THE ZINC AND ZINC OXIDE CONTENT THEREOF INTO ZINC CHLORIDE AND TO OXIDIZE THE IRON AND MANGANESE IMPURITIES THEREOF, MAINTAINING THE PH OF THE SOLUTION FROM ABOUT 4.4 TO 5.8 SELECTIVELY TO DISSOLVE THE ZINC CHLORIDE THEREIN, SEPARATING SOLID RESIDUES FROM THE SOLUTION, INTRODUCING THE ZINC CHLORIDE SOLUTION INTO THE CATHODE COMPARTMENT OF AN ELECTROLYTIC CELL HAVING A PERMEABLE DIAPHRAGM SEPARATING THE CATHODE AND ANODE COMPARTMENTS THEREOF, PASSING AN ELECTRIC CURRENT THROUGH THE CELL TO DEPOSIT ZINC POWDER AT THE CATHODE AND TO LIBERATE CHLORINE AT THE ANODE, WITHDRAWING ELECTROLYTE FROM THE ANODE COMPARTMENT OF THE CELL AND RECIRCULATING A PORTION THEREOF TO THE CATHODE COMPARTMENT IN REGULATED AMOUNTS TO MAINTAIN A POSITIVE FLOW THROUGH THE CELL WITH A PRESSURE DROP OF GREATER THAN ONE MILLIMETER OF WATER ACROSS THE DIAPHRAGM THEREIN, COMBINING AN INCREMENT OF THE CHLORINE RELEASED AT THE
Claim 2
Dependent Claim
191 words
A PROCESS FOR THE PREPARATION OF ZINC POWDER FROM CHLORINE-CONTAINING ZINC-BEARING RAW MATERIALS HAVING PRESENT THEREIN FREE, METALLIC ZINC SELECTED FROM THE GROUP CONSISTING OF SAL SKIMMINGS, GALVANIZING SKIMMINGS AND ZINC ASH COMPRISING LEACHING THE ZINC-BEARING RAW MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING DISSOLVED CHLORINE AND SODIUM CHLORIDE TO CONVERT THE ZINC AND ZINC OXIDE CONTENT THEREOF INTO ZINC CHLORIDE AND TO OXIDIZE THE IRON AND MANGANESE IMPURITIES THEREOF, MAINTAINING THE PH OF THE SOLUTION FROM ABOUT 4.4 TO 5.8 SELECTIVELY TO DISSOLVE THE ZINC CHLORIDE THEREIN, SEPARATING SOLID RESIDUES FROM THE SOLUTION, INTRODUCING THE ZINC CHLORIDE SOLUTION INTO THE CATHODE COMPARTMENT OF AN ELECTROLYTIC CELL HAVING A PERMEABLE DIAPHRAGM SEPARATING THE CATHODE AND ANODE COMPARTMENTS THEREOF, PASSING AN ELECTRIC CURRENT THROUGH THE CELL TO DEPOSIT ZINC POWDER AT THE CATHODE AND TO LIBERATE CHLORINE AT THE ANODE, WITHDRAWING ELECTROLYTE FROM THE ANODE COMPARTMENT OF THE CELL AND RECIRCULATING A PORTION THEREOF TO THE CATHODE COMPARTMENT IN REGULATED AMOUNTS TO MAINTAIN A POSITIVE FLOW THROUGH THE CELL WITH A PRESSURE DROP OF GREATER THAN ONE MILLIMETER OF WATER ACROSS THE DIAPHRAGM THEREIN, COMBINING AN INCREMENT OF THE CHLORINE RELEASED AT THE
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) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |