Patent US5487009A successfully refreshed from Google Patents.
Patent US3209987A successfully refreshed from Google Patents.
US3209987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid ring pump
Assignee: Nash Engineering Co
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Filing: 1964-01-09
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Granted: 1965-10-05
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Expires: 1984-01-09
Abstract
No abstract record available.
Inventors
- 👤 Irving C Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:57
CPC Classifications
F; F04; F04C; F04C19/00; F04C19/005; F04C19/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A DUPLEX SINGLE LOBE LIQUID RING PUMP COMPRISING A CASTING, SAID CASING HAVING OPPOSITELY OFFSET LOBED PORTIONS, A SHAFT EXTENDING THROUGH SAID CASING, A ROTOR HAVING A PLURALITY OF RADIALLY EXRENDING DISPLACEMENT CHAMBERS MOUNTED UPON SAID SHAFT, SAID ROTOR INCLUDING PARTITION MEANS DIVIDING THE DISPLACEMENT CHAMBERS INTO FIRST AND SECOND ADJACENT PUMPING PORTIONS, SAID FIRST AND SECOND ADJACENT PUMPING PORTIONS BEING RESPECTIVELY IN RADIAL ALIGNMENT WITH EACH OF SAID CASING OFFSET PORTIONS, A PAIR OF NON-ROTATING CENTRAL PORT MEANS ABOUT SAID SHAFT EXTENDING AXIALLY INTO OPPOSITE ENDS OF SAID ROTOR, EACH OF SAID PORT MEANS INCLUDING INLET AND DISCHARGE PORTIONS IN COMMUNICATION WITH SAID ROTOR PUMPING PORTIONS, AND HEAD MEANS CLOSINGG THE ENDS OF SAID CASING HAVING INLET AND DISCHARGE PASSAGEWAYS IN COMMUNICATION WITH SAID PORT MEANS INLET AND DISCHARGE PORTIONS.
Claim 2
Dependent Claim
131 words
A DUPLEX SINGLE LOBE LIQUID RING PUMP COMPRISING A CASTING, SAID CASING HAVING OPPOSITELY OFFSET LOBED PORTIONS, A SHAFT EXTENDING THROUGH SAID CASING, A ROTOR HAVING A PLURALITY OF RADIALLY EXRENDING DISPLACEMENT CHAMBERS MOUNTED UPON SAID SHAFT, SAID ROTOR INCLUDING PARTITION MEANS DIVIDING THE DISPLACEMENT CHAMBERS INTO FIRST AND SECOND ADJACENT PUMPING PORTIONS, SAID FIRST AND SECOND ADJACENT PUMPING PORTIONS BEING RESPECTIVELY IN RADIAL ALIGNMENT WITH EACH OF SAID CASING OFFSET PORTIONS, A PAIR OF NON-ROTATING CENTRAL PORT MEANS ABOUT SAID SHAFT EXTENDING AXIALLY INTO OPPOSITE ENDS OF SAID ROTOR, EACH OF SAID PORT MEANS INCLUDING INLET AND DISCHARGE PORTIONS IN COMMUNICATION WITH SAID ROTOR PUMPING PORTIONS, AND HEAD MEANS CLOSINGG THE ENDS OF SAID CASING HAVING INLET AND DISCHARGE PASSAGEWAYS IN COMMUNICATION WITH SAID PORT MEANS INLET AND DISCHARGE PORTIONS.
References Cited (Backward Citations)
US2364370A
Cited
US2974538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |