US20748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fastening the wick-tube in lamp-caps
Assignee: —
•
Filing: —
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Granted: 1858-06-29
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Expires: 1875-06-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:40
CPC Classifications
F; 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) | 1861-06-28 | 1861-12-28 | 1862-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1865-06-28 | 1865-12-28 | 1866-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1869-06-28 | 1869-12-28 | 1870-06-29 | $7700.00 | Window Closed / Lapsed |