US2040167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slag and agitation heat treatment of metals
Assignee: DETROIT ELECTRIC FURNACE Co
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Filing: 1933-12-29
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Granted: 1936-05-12
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Expires: 1953-12-29
Abstract
No abstract record available.
Inventors
- 👤 Edwin L Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:44
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/10; C22B9/106
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) | 1939-05-12 | 1939-11-11 | 1940-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-12 | 1943-11-11 | 1944-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-12 | 1947-11-11 | 1948-05-12 | $7700.00 | Window Closed / Lapsed |