US67981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
David h
Assignee: —
•
Filing: —
•
Granted: 1867-08-20
•
Expires: 1884-08-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/32; G03B17/34
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) | 1870-08-19 | 1871-02-18 | 1871-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1874-08-19 | 1875-02-18 | 1875-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1878-08-19 | 1879-02-18 | 1879-08-20 | $7700.00 | Window Closed / Lapsed |