US84335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in apparatus for making- steel and refining- iron
Assignee: —
•
Filing: —
•
Granted: 1868-11-24
•
Expires: 1885-11-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; C21C5/40
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) | 1871-11-24 | 1872-05-25 | 1872-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1875-11-24 | 1876-05-25 | 1876-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1879-11-24 | 1880-05-25 | 1880-11-24 | $7700.00 | Window Closed / Lapsed |