US18931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for illustrating conic sections and the lines of the globe
Assignee: —
•
Filing: —
•
Granted: 1857-12-22
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Expires: 1874-12-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:01
CPC Classifications
G; G09; G09B; G09B27/00; G09B27/08
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) | 1860-12-21 | 1861-06-22 | 1861-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1864-12-21 | 1865-06-22 | 1865-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1868-12-21 | 1869-06-22 | 1869-12-22 | $7700.00 | Window Closed / Lapsed |