US2576314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extracting of nickel values from nickeliferous sulfide material
Assignee: Viridian Inc Canada
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Filing: 1948-11-06
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Granted: 1951-11-27
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Expires: 1968-11-06
Abstract
No abstract record available.
Inventors
- 👤 Frank A Forward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:19
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0065; C22B15/0078; C22B23/00; C22B23/04; C22B23/0407; C22B23/0446; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
THE METHOD OF EXTRACTING NICKEL VALUES FROM NICKELIFEROUS SULPHIDES WHICH COMPRISES THE STEP OF LEACHING FINELY PULVERULENT MATERIAL CONSISTING ESSENTIALLY OF NICKELIFEROUS SULPHIDES WITH STRONG AQUEOUS AMMONIA SUBSTANTIALLY FREE FROM AM-
Claim 2
Independent Claim
31 words
THE METHOD OF EXTRACTING NICKEL VALUES FROM NICKELIFEROUS SULPHIDES WHICH COMPRISES THE STEP OF LEACHING FINELY PULVERULENT MATERIAL CONSISTING ESSENTIALLY OF NICKELIFEROUS SULPHIDES WITH STRONG AQUEOUS AMMONIA SUBSTANTIALLY FREE FROM AM-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |