US1850009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of metals out of their ores
Assignee: Individual
•
Filing: 1929-02-28
•
Granted: 1932-03-15
•
Expires: 1949-02-28
Abstract
No abstract record available.
Inventors
- 👤 Gronwall Eugen Assar Alexis
- 👤 Nathorst Harry Johan Hjalmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:43
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/02; C21B13/023; C22; C22B; C22B5/00; C21B2100/00; C21B2100/20; C21B2100/22; C21B2100/26; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
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) | 1935-03-15 | 1935-09-14 | 1936-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-15 | 1939-09-14 | 1940-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-15 | 1943-09-14 | 1944-03-15 | $7700.00 | Window Closed / Lapsed |