US2839381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of metallic sulfide ores
Assignee: LEE FOUNDATION FOR NUTRITIONAL
•
Filing: 1955-01-03
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Granted: 1958-06-17
•
Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Lee Royal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:53
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0073; C22; C22B; C22B5/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
THE METHOD OF REDUCING A METALLIC SULFIDE ORE, WHICH COMPRISES SUBJECTING THE ORE IN DIVIDED CONDITION TO THE ACTION OF HYDROGEN IN A REDUCTION ZONE AT AN ELEVATED REACTION TEMPERATURE BELOW THE MELTING POINT OF THE METAL TO OBTAIN POWDERED METAL AND HYDROGEN SULFIDE, WITH DRAWING THE HYDROGEN SULFIDE FROM REDUCTION ZONE, DECOMPOSING THE WITHDRAWN HYDROGEN SULFIDE TO OBTAIN HYDROGEN, AND RETURNING THE RECOVERED HYDROGEN TO THE
Claim 2
Independent Claim
67 words
THE METHOD OF REDUCING A METALLIC SULFIDE ORE, WHICH COMPRISES SUBJECTING THE ORE IN DIVIDED CONDITION TO THE ACTION OF HYDROGEN IN A REDUCTION ZONE AT AN ELEVATED REACTION TEMPERATURE BELOW THE MELTING POINT OF THE METAL TO OBTAIN POWDERED METAL AND HYDROGEN SULFIDE, WITH DRAWING THE HYDROGEN SULFIDE FROM REDUCTION ZONE, DECOMPOSING THE WITHDRAWN HYDROGEN SULFIDE TO OBTAIN HYDROGEN, AND RETURNING THE RECOVERED HYDROGEN TO THE
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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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |