Patent US1829268A successfully refreshed from Google Patents.
US1829268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft furnace for treating solid materials with gases
Assignee: NORSK STAAL ELEK SK GASREDUKTI
•
Filing: 1928-08-17
•
Granted: 1931-10-27
•
Expires: 1948-08-17
Abstract
No abstract record available.
Inventors
- 👤 Edwin Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:51
CPC Classifications
F; F27; F27B; F27B21/00; F27B21/06; F27B1/00; F27B1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1934-10-26 | 1935-04-27 | 1935-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-10-26 | 1939-04-27 | 1939-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-10-26 | 1943-04-27 | 1943-10-27 | $7700.00 | Window Closed / Lapsed |