US3449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in combined water-wheels
Assignee: —
•
Filing: —
•
Granted: 1844-02-20
•
Expires: 1861-02-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:41
CPC Classifications
F; F04; F04D; F04D19/00; F04D19/02; F04D19/026; F03; F03B; F03B3/00
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) | 1847-02-19 | 1847-08-21 | 1848-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1851-02-19 | 1851-08-21 | 1852-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1855-02-19 | 1855-08-21 | 1856-02-20 | $7700.00 | Window Closed / Lapsed |