US45390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in gas-regulating valves
Assignee: —
•
Filing: —
•
Granted: 1864-12-13
•
Expires: 1881-12-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/54; F16K25/00; F16K25/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1867-12-13 | 1868-06-13 | 1868-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1871-12-13 | 1872-06-13 | 1872-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1875-12-13 | 1876-06-13 | 1876-12-13 | $7700.00 | Window Closed / Lapsed |