Patent US1721A successfully refreshed from Google Patents.
US1721A
Expired / Lapsed
US
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Assignee: —
•
Filing: —
•
Granted: 1840-08-12
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Expires: 1857-08-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:17
CPC Classifications
B; B27; B27B; B27B1/00; B27B1/002; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2074; Y10T83/2077; Y10T83/2092; Y10T83/2209; Y10T83/2216; Y10T83/647; Y10T83/664; Y10T83/6649; Y10T83/768; Y10T83/7684; Y10T83/7693
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) | 1843-08-12 | 1844-02-11 | 1844-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1847-08-12 | 1848-02-11 | 1848-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1851-08-12 | 1852-02-11 | 1852-08-12 | $7700.00 | Window Closed / Lapsed |