US23447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
John b
Assignee: —
•
Filing: —
•
Granted: 1859-04-05
•
Expires: 1876-04-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:14
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/02
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) | 1862-04-04 | 1862-10-04 | 1863-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1866-04-04 | 1866-10-04 | 1867-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1870-04-04 | 1870-10-04 | 1871-04-05 | $7700.00 | Window Closed / Lapsed |