Patent US6234175B1 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 03:43
CPC Classifications
—
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
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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) | 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 |