Patent US3204861A successfully refreshed from Google Patents.
US3204861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump and control therefor
Assignee: SWANTON WILLIAM F
•
Filing: 1962-01-25
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Granted: 1965-09-07
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Expires: 1982-01-25
Abstract
No abstract record available.
Inventors
- 👤 Kenard D Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:21
CPC Classifications
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Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A VACUUM PUMP COMPRISING A TANK HAVING A BODY OF LIQUID THEREIN, A COMBINED LIQUID AND VAPOR PUMP OF THE SINGLE SCREW TYPE IN SAID TANK BELOW THE LEVEL OF LIQUID THEREIN FOR DISCHARGING FLUID INTO SAID BODY OF LIQUID BELOW ITS LEVEL IN SAID TANK, MEANS PROVIDING AN INTAKE CHAMBER FOR SAID PUMP, MEANS BELOW THE LEVEL OF LIQUID IN SAID TANK FOR PROVIDING COMMUNICATION BETWEEN SAID INTAKE CHAMBER AND SAID TANK AND FOR ADMITTING SUBSTANTIAL QUANTITIES OF LIQUID FROM SAID BODY TO SAID PUMP, SUCTION CONDUIT MEANS PROVIDING A VAPOR INLET FOR SAID INTAKE CHAMBER, MEANS FOR DRIVING SAID PUMP, AND MEANS FOR ADJUSTING SAID COMMUNICATION MEANS FOR CONTROLLING THE RATE OF RECIRCULATION OF
Claim 2
Dependent Claim
116 words
A VACUUM PUMP COMPRISING A TANK HAVING A BODY OF LIQUID THEREIN, A COMBINED LIQUID AND VAPOR PUMP OF THE SINGLE SCREW TYPE IN SAID TANK BELOW THE LEVEL OF LIQUID THEREIN FOR DISCHARGING FLUID INTO SAID BODY OF LIQUID BELOW ITS LEVEL IN SAID TANK, MEANS PROVIDING AN INTAKE CHAMBER FOR SAID PUMP, MEANS BELOW THE LEVEL OF LIQUID IN SAID TANK FOR PROVIDING COMMUNICATION BETWEEN SAID INTAKE CHAMBER AND SAID TANK AND FOR ADMITTING SUBSTANTIAL QUANTITIES OF LIQUID FROM SAID BODY TO SAID PUMP, SUCTION CONDUIT MEANS PROVIDING A VAPOR INLET FOR SAID INTAKE CHAMBER, MEANS FOR DRIVING SAID PUMP, AND MEANS FOR ADJUSTING SAID COMMUNICATION MEANS FOR CONTROLLING THE RATE OF RECIRCULATION OF
References Cited (Backward Citations)
US899820A
Cited
US907392A
Cited
US928775A
Cited
US1188286A
Cited
US1273900A
Cited
US1355231A
Cited
US1568104A
Cited
US1409868A
Cited
US1439810A
Cited
US1507310A
Cited
US2290137A
Cited
US2361146A
Cited
US2885328A
Cited
US2862454A
Cited
US2960449A
Cited
US3073514A
Cited
US2971897A
Cited
US3016833A
Cited
US2988998A
Cited
US3084851A
Cited
US3073513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |