US4271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in writing-machines
Assignee: —
•
Filing: —
•
Granted: 1845-11-18
•
Expires: 1862-11-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:46
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/485; B41J2/49
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) | 1848-11-17 | 1849-05-19 | 1849-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1852-11-17 | 1853-05-19 | 1853-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1856-11-17 | 1857-05-19 | 1857-11-18 | $7700.00 | Window Closed / Lapsed |