Patent US3689931A successfully refreshed from Google Patents.
US3689931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pumps
Assignee: Gelman Sciences Inc
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Filing: 1971-05-19
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Granted: 1972-09-05
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Expires: 1991-05-19
Abstract
Abstract THE INVENTION RELATED TO A SELF-PRIMING ROTODYNAMIC CENTRIFUGAL PUMP AND MORE PARTICULAR TO THE NOVEL VERTICALLY SPLIT CASING, THE CYLINDRICAL PERIPHERAL CLOSING RING AND NOVEL IMPELLER EMBODYING A FLUTED CONICAL IMPULSOR PLANETARY DISC AND SPHERES OR "PLANETS" WHICH ALSO ARE THE MAIN IMPELLER SUPPORT AND BALL BEARINGS, THE VERTICAL "O" RINGS AND ANNULAR GASKET SEALS SOLUTION TO EXPANSION AND CONTRACTION AND THE RECIRCULATION PASSAGE AND AIR PASSAGE PORTS FOR THE PRIMING CYCLE. D R A W I N G
Inventors
- 👤 Luis R Pagan Fortis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:17
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D1/00; F04D1/04; F04D29/2238; F04D29/2255; F04D9/00; F04D9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |