Method and apparatus for controlling liquid levels
Abstract
Abstract METHOD AND APPARATUS FOR CONTROLLING THE LEVEL OF A BODY OF MATERIAL IN A CONTAINER WHEN REPLENISHING MATERIAL REMOVE FROM THE BODY, BY SENSING LEVELS OUTSIDE OF A PREDETERMINED RANGE OF LEVELS OF THE MATERIAL, INCREASING THE RATE OF FEED OF THE REPLENISHING MATERIAL BY AN AMOUNT PROPORTIONAL TO THE TIME THE LEVEL IS BELOW THE RANGE, AND DECREASING THE RATE OF FEED OF THE REPLENISHING MATERIAL BY AN AMOUNT PROPORTIONAL TO THE TIME THE LEVEL IS ABOVE THE RANGE. THE PREVENT OSCILLATION OF THE SYSTEM AND ATTAIN STABILITY THE RATE OF FEED IS FURTHER INCREASED BY A PREDETERMINED CONSTANT AMOUNT WHEN THE LEVEL IS BELOW THE RANGE, THIS FURTHER INCREASE IN FEED RATE BEING REMOVED WHEN THE LEVEL RETURNS TO THE RANGE. THE RATE OF FEED IS FURTHER DECREASED BY A PREDETERMINED CONSTANT AMOUNT WHEN THE LEVEL IS ABOVE THE RANGE, THE FURTHER DECREASE IN FEED RATE BEING REMOVED WHEN THE LEVEL RETURNS TO THE RANGE.
Inventors
- 👤 Sheldon A Canfield
- 👤 Cletis L Roberson
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |