US3404697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant liquid level control apparatus and method
Assignee: Gulf Research and Development Co
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Filing: 1966-02-14
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Granted: 1968-10-08
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Expires: 1986-02-14
Abstract
No abstract record available.
Inventors
- 👤 Bruce R Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:07
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/04; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/8593; Y10T137/85954; Y10T137/85978; Y10T137/86131; Y10T137/86139; Y10T137/86147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD FOR MAINTAINING A CONSTANT LEVEL IN A VESSEL SUPPLIED WITH LIQUID FROM AN OVERHEAD RESERVOIR COMPRISING INJECTING LIQUID FROM SAID OVERHEAD RESERVOIR TO SAID CONSTANT LEVEL VESSEL BY POSITIVE DISPLACEMENT PUMPING THROUGH A NORMALLY CLOSED LIQUID-TIGHT VALVE WHICH IS RESILIENTLY URGED OPEN BY THE INJECTION PUMPING LIQUID PRESSURE, AND CONCOMITANTLY DRAWING OFF LIQUID TENDING TO RISE ABOVE THE CONTROL LEVEL IN SAID CONSTANT LEVEL VESSEL AND INJECTING SAID LIQUID BACK TO SAID OVERHEAD RESERVOIR BY POSITIVE DISPLACEMENT PUMPING THROUGH ANOTHER NORMALLY CLOSED LIQUID-TIGHT VALVE WHICH IS RESILIENTLY URGED OPEN BY THE INJECTION PUMPING FLUID PRESSURE.
Claim 2
Independent Claim
97 words
A METHOD FOR MAINTAINING A CONSTANT LEVEL IN A VESSEL SUPPLIED WITH LIQUID FROM AN OVERHEAD RESERVOIR COMPRISING INJECTING LIQUID FROM SAID OVERHEAD RESERVOIR TO SAID CONSTANT LEVEL VESSEL BY POSITIVE DISPLACEMENT PUMPING THROUGH A NORMALLY CLOSED LIQUID-TIGHT VALVE WHICH IS RESILIENTLY URGED OPEN BY THE INJECTION PUMPING LIQUID PRESSURE, AND CONCOMITANTLY DRAWING OFF LIQUID TENDING TO RISE ABOVE THE CONTROL LEVEL IN SAID CONSTANT LEVEL VESSEL AND INJECTING SAID LIQUID BACK TO SAID OVERHEAD RESERVOIR BY POSITIVE DISPLACEMENT PUMPING THROUGH ANOTHER NORMALLY CLOSED LIQUID-TIGHT VALVE WHICH IS RESILIENTLY URGED OPEN BY THE INJECTION PUMPING FLUID PRESSURE.
References Cited (Backward Citations)
US2225498A
Cited
US2287396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |