US1378595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing carbonates of the alkaline-earth metals
Assignee: Mathieson Alkali Works Inc
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Filing: 1920-02-19
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Granted: 1921-05-17
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Expires: 1940-02-19
Abstract
No abstract record available.
Inventors
- 👤 James H Macmahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:51
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/186; C01F11/188
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) | 1924-05-16 | 1924-11-15 | 1925-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-05-16 | 1928-11-15 | 1929-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-05-16 | 1932-11-15 | 1933-05-17 | $7700.00 | Window Closed / Lapsed |