US2391728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alkali metals
Assignee: Dow Chemical Co
•
Filing: 1944-10-30
•
Granted: 1945-12-25
•
Expires: 1964-10-30
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Mcconica
- 👤 Arthur A Macphail
- 👤 Roy C Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:59
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/10; Y; Y10; Y10S; Y10S266/00; Y10S266/905
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) | 1948-12-24 | 1949-06-25 | 1949-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-24 | 1953-06-25 | 1953-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-24 | 1957-06-25 | 1957-12-25 | $7700.00 | Window Closed / Lapsed |