Swimming pool backwash assembly
August 22, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3365064 Time delayed shut-down circuit for recirculation pump Valve drive means for backwash filter valves Backwash control for constant volume-pressure filtration system Liquid pump control Microprocessor based pump controller for backwashable filter Backwash valve lever control system Automatic valve assembly Pool water purification system Swimming pool control system InventorApplicationNo. 10645701 filed on 08/22/2003US Classes:210/108, Backwash or blowback210/138, WITH TIME CONTROL210/169, Aquarium or swimming pool210/258, With pump, gas pressure or vacuum source210/416.2, For aquarium or swimming pool417/12Having timer or delay meansExaminersPrimary: Cecil, Terry K.Attorney, Agent or FirmInternational ClassesE04H 4/00B01D 35/157 AbstractA swimming pool backwash control arrangement includes a timing device incorporated with a valve for controlling normal re-circulating flow and backwash flow through a swimming pool filter. The timer is constructed to be in series with the electric power circuit to the pool pump and is activated when the valve is moved to the backwash flow position. The timer functions to maintain electric power to the pump for a user-specified or a pre-set period. At the end of the period the timer will cause the circuit to open thereby disabling the pump. Power can be restored to the pump by returning the valve to its normal re-circulating flow position. | |
