US2759428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Individual
•
Filing: 1952-12-02
•
Granted: 1956-08-21
•
Expires: 1972-12-02
Abstract
No abstract record available.
Inventors
- 👤 John E Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:30
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/426; F04D29/4286
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US844822A
Cited
GB341362A
Cited
US1878429A
Cited
US2110079A
Cited
US2258527A
Cited
US2232648A
Cited
US2283348A
Cited
US2365058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |