US202725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in double-acting pumps
Assignee: —
•
Filing: —
•
Granted: 1878-04-23
•
Expires: 1895-04-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:51
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839
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) | 1881-04-22 | 1881-10-22 | 1882-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1885-04-22 | 1885-10-22 | 1886-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1889-04-22 | 1889-10-22 | 1890-04-23 | $7700.00 | Window Closed / Lapsed |