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Patent US21212A successfully refreshed from Google Patents.
US21212A
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US
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Improvement in grain-drills
Assignee: —
•
Filing: —
•
Granted: 1858-08-17
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Expires: 1875-08-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:28
CPC Classifications
A; A01; A01C; A01C15/00; A01C15/16
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) | 1861-08-16 | 1862-02-15 | 1862-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1865-08-16 | 1866-02-15 | 1866-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1869-08-16 | 1870-02-15 | 1870-08-17 | $7700.00 | Window Closed / Lapsed |