US1903909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary heat treating furnace
Assignee: Electric Furnace Co
•
Filing: 1930-04-30
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Granted: 1933-04-18
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Expires: 1950-04-30
Abstract
No abstract record available.
Inventors
- 👤 Frank T Cope
- 👤 Arthur H Vaughan
- 👤 Wilbur S Bowling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0037; C23; C23C; C23C8/00; C23C8/06
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) | 1936-04-17 | 1936-10-17 | 1937-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-17 | 1940-10-17 | 1941-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-17 | 1944-10-17 | 1945-04-18 | $7700.00 | Window Closed / Lapsed |