US39820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in gas-burners
Assignee: —
•
Filing: —
•
Granted: 1863-09-08
•
Expires: 1880-09-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
B; B05; B05B; B05B1/00; B05B1/005; B05B1/14
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) | 1866-09-07 | 1867-03-09 | 1867-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1870-09-07 | 1871-03-09 | 1871-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1874-09-07 | 1875-03-09 | 1875-09-08 | $7700.00 | Window Closed / Lapsed |