Patent US2687280A successfully refreshed from Google Patents.
US2687280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump-turbine
Assignee: —
•
Filing: —
•
Granted: 1954-08-24
•
Expires: 1971-08-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:57
CPC Classifications
F; F03; F03B; F03B1/00; F04; F04D; F04D13/00; F04D13/02; F04D13/04; Y; Y10; Y10S; Y10S415/00; Y10S415/91
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB205490A
Cited
GB250234A
Cited
US1951640A
Cited
DE511187C
Cited
US2010555A
Cited
US1954193A
Cited
US1962385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |