US3217975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump device
Assignee: Nash Engineering Co
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Filing: 1964-12-17
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Granted: 1965-11-16
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Expires: 1984-12-17
Abstract
No abstract record available.
Inventors
- 👤 Irving C Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:44
CPC Classifications
F; F04; F04C; F04C19/00; F04C19/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A HIGH VACUUM LIQUID RING PUMP OF THE TYPE HAVING AN ANNULAR ROTOR INCLUDING A PLURALITY OF RADIAL BLADES AND END SHROUD PORTIONS TO FORM IN COMBINATION THEREWITH A PLURALITY OF RADIALLY EXTENDING OPEN ENDED DISPLACEENT CHAMBERS, AND A LOBED CASING MEMBER ENCLOSING SAID ROTOR, INCLUDING A STATIONARY CENTRAL PORT MEMBER HAVING INLET AND A DISCHARGE PASSAGEWAYS THEREIN IN COMMUNICATION WITH THE INNER BOUNDARY OF THE DISPLACEMENT CHAMBERS OF SAID ANNULAR ROTOR, AND END WALL PORTIONS COOPERATIVE WITH THE ROTOR END SHROUD PORTIONS TO FORM ROTOR SHROUD SEAL CHAMBERS THEREBETWEEN, THE IMPROVEMENT COMPRISING, CONDUIT MEANS IN COMMUNICATION WITH SAID ROTOR SHROUD SEAL CHAMBERS AND MEANS FOR REMOVING SEAL LIQUID FROM SAID SEAL CHAMBERS THROUGH SAID CONDUIT MEANS TO PREVENT SURGING WHEN SAID HIGH VACUUM LIQUID RING PUMP IS OPERATED AT RELATIVELY LOW VACUUM LEVELS.
Claim 2
Dependent Claim
135 words
IN A HIGH VACUUM LIQUID RING PUMP OF THE TYPE HAVING AN ANNULAR ROTOR INCLUDING A PLURALITY OF RADIAL BLADES AND END SHROUD PORTIONS TO FORM IN COMBINATION THEREWITH A PLURALITY OF RADIALLY EXTENDING OPEN ENDED DISPLACEENT CHAMBERS, AND A LOBED CASING MEMBER ENCLOSING SAID ROTOR, INCLUDING A STATIONARY CENTRAL PORT MEMBER HAVING INLET AND A DISCHARGE PASSAGEWAYS THEREIN IN COMMUNICATION WITH THE INNER BOUNDARY OF THE DISPLACEMENT CHAMBERS OF SAID ANNULAR ROTOR, AND END WALL PORTIONS COOPERATIVE WITH THE ROTOR END SHROUD PORTIONS TO FORM ROTOR SHROUD SEAL CHAMBERS THEREBETWEEN, THE IMPROVEMENT COMPRISING, CONDUIT MEANS IN COMMUNICATION WITH SAID ROTOR SHROUD SEAL CHAMBERS AND MEANS FOR REMOVING SEAL LIQUID FROM SAID SEAL CHAMBERS THROUGH SAID CONDUIT MEANS TO PREVENT SURGING WHEN SAID HIGH VACUUM LIQUID RING PUMP IS OPERATED AT RELATIVELY LOW VACUUM LEVELS.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |