Patent US2856858A successfully refreshed from Google Patents.
US2856858A
Expired / Lapsed
US
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Centrifugal pump
Assignee: WR Grace and Co
•
Filing: 1953-07-13
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Granted: 1958-10-21
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Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 Edward J Purcell
- 👤 Dudley W Flagler
- 👤 George L Harville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:22
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/426; F04D29/4286; F04D29/60; F04D29/605; F04D29/62; F04D29/628
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |