US32204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in steam-boilers
Assignee: —
•
Filing: —
•
Granted: 1861-04-30
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Expires: 1878-04-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:13
CPC Classifications
F; F22; F22B; F22B17/00; F22B17/10; F22B17/12
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) | 1864-04-29 | 1864-10-29 | 1865-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1868-04-29 | 1868-10-29 | 1869-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1872-04-29 | 1872-10-29 | 1873-04-30 | $7700.00 | Window Closed / Lapsed |