US42541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in check-valves
Assignee: —
•
Filing: —
•
Granted: 1864-04-26
•
Expires: 1881-04-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:13
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/10; F16K11/14; F16K11/16; F16K11/163; B; B01; B01F; B01F25/00; B01F25/30; B01F25/31; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/7722; Y10T137/7837; Y10T137/7866
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) | 1867-04-26 | 1867-10-26 | 1868-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1871-04-26 | 1871-10-26 | 1872-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1875-04-26 | 1875-10-26 | 1876-04-26 | $7700.00 | Window Closed / Lapsed |