Patent US1827349A successfully refreshed from Google Patents.
US2123990A
Expired / Lapsed
US
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Production of metallic magnesium
Assignee: American Magnesium Metals Corp
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Filing: 1937-03-23
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Granted: 1938-07-19
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Expires: 1957-03-23
Abstract
No abstract record available.
Inventors
- 👤 Erdmann Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:09
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-07-18 | 1942-01-17 | 1942-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-07-18 | 1946-01-17 | 1946-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-07-18 | 1950-01-17 | 1950-07-19 | $7700.00 | Window Closed / Lapsed |