US2950964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of lead
Assignee: Viridian Inc Canada
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Filing: 1959-05-13
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Granted: 1960-08-30
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Expires: 1979-05-13
Abstract
No abstract record available.
Inventors
- 👤 Frank A Forward
- 👤 Veltman Herbert
- 👤 Vizsolyi Andrew Imre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:24
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/282; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A PROCESS FOR THE PRODUCTION OF LEAD FROM LEAD BEARING MATERIAL, THE IMPROVEMENT WHICH COMPRISES LEACHING A LEAD COMPOUND SELECTED FROM THE GROUP CONSISTING OF LEAD SULPHATE, LEAD CHLORIDE, LEAD NITRATE, LEAD ACETATE AND LEAD OXIDE WITH A BASIC AQUEOUS SOLUTION WHICH CONTAINS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYLENE AND ALKANOL AMINES AND ACID SALTS AND DERIVATIVES THEREOF WHICH IS SOLUBLE IN WATER AND WHICH IS PRESENT IN AMOUNT SUFFICIENT TO COMBINE WITH THE LEAD CONTENT OF SAID LEAD COMPOUND.
Claim 2
Dependent Claim
84 words
IN A PROCESS FOR THE PRODUCTION OF LEAD FROM LEAD BEARING MATERIAL, THE IMPROVEMENT WHICH COMPRISES LEACHING A LEAD COMPOUND SELECTED FROM THE GROUP CONSISTING OF LEAD SULPHATE, LEAD CHLORIDE, LEAD NITRATE, LEAD ACETATE AND LEAD OXIDE WITH A BASIC AQUEOUS SOLUTION WHICH CONTAINS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYLENE AND ALKANOL AMINES AND ACID SALTS AND DERIVATIVES THEREOF WHICH IS SOLUBLE IN WATER AND WHICH IS PRESENT IN AMOUNT SUFFICIENT TO COMBINE WITH THE LEAD CONTENT OF SAID LEAD COMPOUND.
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) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |