US31951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
burlingame
Assignee: —
•
Filing: —
•
Granted: 1861-04-09
•
Expires: 1878-04-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/02; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0219
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) | 1864-04-08 | 1864-10-08 | 1865-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1868-04-08 | 1868-10-08 | 1869-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1872-04-08 | 1872-10-08 | 1873-04-09 | $7700.00 | Window Closed / Lapsed |