US4532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-air furnace
Assignee: —
•
Filing: —
•
Granted: 1846-05-23
•
Expires: 1863-05-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:51
CPC Classifications
F; F24; F24H; F24H3/00
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) | 1849-05-22 | 1849-11-21 | 1850-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1853-05-22 | 1853-11-21 | 1854-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1857-05-22 | 1857-11-21 | 1858-05-23 | $7700.00 | Window Closed / Lapsed |