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US34970A
Expired / Lapsed
US
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Improvement in camera-obscu ras
Assignee: —
•
Filing: —
•
Granted: 1862-04-15
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Expires: 1879-04-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/02; G02B23/08
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) | 1865-04-14 | 1865-10-14 | 1866-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1869-04-14 | 1869-10-14 | 1870-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1873-04-14 | 1873-10-14 | 1874-04-15 | $7700.00 | Window Closed / Lapsed |