Patent US4897657A successfully refreshed from Google Patents.
US41498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in chimney-f
Assignee: —
•
Filing: —
•
Granted: 1864-02-09
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Expires: 1881-02-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:31
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/14; E04D13/1407
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) | 1867-02-08 | 1867-08-10 | 1868-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1871-02-08 | 1871-08-10 | 1872-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1875-02-08 | 1875-08-10 | 1876-02-09 | $7700.00 | Window Closed / Lapsed |