Patent US2273323A successfully refreshed from Google Patents.
US2570232A
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Continuous process for recovery of magnesium
Assignee: NORTH CAROLINA MAGNESIUM DEV C
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Filing: 1945-06-26
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Granted: 1951-10-09
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Expires: 1965-06-26
Abstract
No abstract record available.
Inventors
- 👤 Fritz J Hansgirg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:37
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A CONTINUOUS PROCESS FOR THE RECOVERY OF METALLIC MAGNESIUM WHICH IS APPLICABLE TO THE THERMAL REDUCTION METHOD INVOLVING NON-CARBOTHERMAL REDUCTION OF MAGNESIUM AND WHICH WILL NOT EVOLVE GASEOUS PRODUCTS, AND TO THE EVAPORATION OF MAGNESIUM CONTAINED IN THE DUST PRODUCED BY THERMAL REDUCTION METHODS; WHICH PROCESS COMPRISES ESTABLISHING TWO CONDUCTIVE TREATMENT ZONES UNDER SEPARATE VACUUM CONDITIONS, THE FIRST FOR PRETREATMENT AND THE SECOND FOR EVOLUTION OF MAGNESIUM; FEEDING SUCCESSIVE CHARGES OF RAW MATERIAL THROUGH THE PRETREATMENT ZONE AND THENCE INTO THE SECOND NAMED ZONE WITHOUT EXPOSURE TO THE ATMOSPHERE OR SUBSTANTIAL LOSS OF VACUUM IN THE EITHER ZONE; HEATING THE CHARGES
Claim 2
Dependent Claim
101 words
A CONTINUOUS PROCESS FOR THE RECOVERY OF METALLIC MAGNESIUM WHICH IS APPLICABLE TO THE THERMAL REDUCTION METHOD INVOLVING NON-CARBOTHERMAL REDUCTION OF MAGNESIUM AND WHICH WILL NOT EVOLVE GASEOUS PRODUCTS, AND TO THE EVAPORATION OF MAGNESIUM CONTAINED IN THE DUST PRODUCED BY THERMAL REDUCTION METHODS; WHICH PROCESS COMPRISES ESTABLISHING TWO CONDUCTIVE TREATMENT ZONES UNDER SEPARATE VACUUM CONDITIONS, THE FIRST FOR PRETREATMENT AND THE SECOND FOR EVOLUTION OF MAGNESIUM; FEEDING SUCCESSIVE CHARGES OF RAW MATERIAL THROUGH THE PRETREATMENT ZONE AND THENCE INTO THE SECOND NAMED ZONE WITHOUT EXPOSURE TO THE ATMOSPHERE OR SUBSTANTIAL LOSS OF VACUUM IN THE EITHER ZONE; HEATING THE CHARGES
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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) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |