US21890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp-wick
Assignee: —
•
Filing: —
•
Granted: 1858-10-26
•
Expires: 1875-10-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
F; F21; F21V; F21V37/00; F23; F23D; F23D3/00
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) | 1861-10-25 | 1862-04-26 | 1862-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1865-10-25 | 1866-04-26 | 1866-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1869-10-25 | 1870-04-26 | 1870-10-26 | $7700.00 | Window Closed / Lapsed |