Patent US3305353A successfully refreshed from Google Patents.
US3305353A
Expired / Lapsed
US
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Accelerated microbiological ore extraction process
Assignee: BC Research (Canada)
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Filing: 1964-03-30
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Granted: 1967-02-21
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Douglas W Duncan
- 👤 Cecil C Walden
- 👤 Paul C Trussell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:48
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/15; Y10S423/17; Y10S435/00; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A METHOD OF BACTERIOLOGICAL EXTRACTION OF METALS FROM MATERIALS COMPRISING METALLIC SULFIDES WHICH PROCESS COMPRISES CONTACTING PARTICLES OF SAID MATERIAL WITH AN AQUEOUS ACIDIC LEACHING MEDIUM, SAID MEDIUM COMPRISING A MINERAL ACID, SULFIDE-OXIDIZING BACTERIA AND NUTRIENT FOR SAID BACTERIA, SUBJECTING THE LEACHING MEDIUM TO AGITATION TO MAINTAIN SAID PARTICLES SUSPENDED IN SAID MEDIUM, AND AERATING SAID MEDIUM DURING SAID AGITATION TO PROVIDE OXYGEN FOR THE OXIDATION OF SAID SULFIDE BY SAID BACTERIA.
Claim 2
Independent Claim
72 words
A METHOD OF BACTERIOLOGICAL EXTRACTION OF METALS FROM MATERIALS COMPRISING METALLIC SULFIDES WHICH PROCESS COMPRISES CONTACTING PARTICLES OF SAID MATERIAL WITH AN AQUEOUS ACIDIC LEACHING MEDIUM, SAID MEDIUM COMPRISING A MINERAL ACID, SULFIDE-OXIDIZING BACTERIA AND NUTRIENT FOR SAID BACTERIA, SUBJECTING THE LEACHING MEDIUM TO AGITATION TO MAINTAIN SAID PARTICLES SUSPENDED IN SAID MEDIUM, AND AERATING SAID MEDIUM DURING SAID AGITATION TO PROVIDE OXYGEN FOR THE OXIDATION OF SAID SULFIDE BY SAID BACTERIA.
References Cited (Backward Citations)
US2829964A
Cited
US3218252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |