US2844678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sump pump system
Assignee: Individual
•
Filing: 1953-04-20
•
Granted: 1958-07-22
•
Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Axel L Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US868464A
Cited
US669037A
Cited
US1736198A
Cited
US1985659A
Cited
US1984670A
Cited
US2635546A
Cited
US2625107A
Cited
US2680168A
Cited
US2787960A
Cited
US2730591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |