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| Number | Title | Issue Date |
| 4228000 | Water treatment apparatus with means for automatic disinfection thereof A water treatment device of the type which automatically regenerates itself at predetermined intervals is provided with a special disinfectant feeder device which dispenses a predetermined amount of disinfectant into the water treating media bed and the d... | 10/14/1980 |
| 4210532 | Water conditioner rotary valve structure A combined closure and rotary water valve assembly provided for closing the open upper end of a water softener mineral tank to be used in conjunction with a brine water tank including a float valve controlled brine water outlet and water supply line from ... | 07/01/1980 |
| 4136032 | Liquid treatment apparatus A flow control valve for multicycle liquid treatment apparatus has a pair of rotatable, slotted circular discs at its opposite ends. Rotation of the discs causes the slots to be selectively aligned with various ports, passages, holes and channels so as to... | 01/23/1979 |
| 4105555 | Multi-port valve A valve is provided adapted to multiple modes of use including filter, backwash, rinse, recirculate, and direct to waste, on a swimming pool filter of the type normally filtering water under pressure through a backwash-regenerable filtering medium dispose... | 08/08/1978 |
| 4062777 | Solid-fluid contacting apparatus A solid-fluid contacting apparatus, comprising an outer generally tubular housing member, preferably cylindrical in shape; an inner generally tubular housing member defining a fluid flow channel therein and being placed inside of the outer housing member ... | 12/13/1977 |
| 4032442 | By-pass and synchronized blow system and method for rotary vacuum filters A method and system for use with rotary vacuum filters having a plurality of circumferentially spaced filter segments, for selectively applying blower air to the filter segments at predetermined rotational positions at which relatively unrestricted openin... | 06/28/1977 |
| 3962089 | Apparatus for softening hard water An apparatus for softening hard water, wherein a raw water pipe, a soft water pipe, a discharge pipe and a salt water pipe are connected with a cylindrical valve seat equipped on a softening tank accommodating ion-exchange resin to open into said tank, a ... | 06/08/1976 |
| 3960721 | Fluid treating apparatus and method A fluid treating apparatus and method are provided which employ finely subdivided surface active particles arranged in loose bed form and confined within a treating tank by means which prevent the escape of such particles but which permits fluid flow ther... | 06/01/1976 |
