Patent US34556A successfully refreshed from Google Patents.
US34556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in steam-boilers
Assignee: —
•
Filing: —
•
Granted: 1862-03-04
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Expires: 1879-03-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:52
CPC Classifications
F; F22; F22B; F22B13/00; F22B13/02; F22B13/023
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) | 1865-03-03 | 1865-09-02 | 1866-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1869-03-03 | 1869-09-02 | 1870-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1873-03-03 | 1873-09-02 | 1874-03-04 | $7700.00 | Window Closed / Lapsed |