US1875787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of melting or heating material in an electrical furnace
Assignee: Individual
•
Filing: 1929-08-19
•
Granted: 1932-09-06
•
Expires: 1949-08-19
Abstract
No abstract record available.
Inventors
- 👤 Wennerstrom Karl Gustaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:56
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1935-09-06 | 1936-03-07 | 1936-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-09-06 | 1940-03-07 | 1940-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-09-06 | 1944-03-07 | 1944-09-06 | $7700.00 | Window Closed / Lapsed |