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US27688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in the manufacture of iron
Assignee: —
•
Filing: —
•
Granted: 1860-04-03
•
Expires: 1877-04-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:06
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/02
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) | 1863-04-03 | 1863-10-03 | 1864-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1867-04-03 | 1867-10-03 | 1868-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1871-04-03 | 1871-10-03 | 1872-04-03 | $7700.00 | Window Closed / Lapsed |