US2652778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic centrifugal pump
Assignee: Individual
•
Filing: 1949-09-06
•
Granted: 1953-09-22
•
Expires: 1969-09-06
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Crever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/02; H02K44/04; F; F04; F04D; F04D7/00; F04D7/02; F04D7/06; F04D7/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |