Patent US2474443A successfully refreshed from Google Patents.
US2474443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drum type induction furnace
Assignee: Ajax Engineering Corp
•
Filing: 1947-11-29
•
Granted: 1949-06-28
•
Expires: 1967-11-29
Abstract
No abstract record available.
Inventors
- 👤 Tama Mario
- 👤 Hoff James Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:17
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/16; H05B6/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |