Abstract: The immersion extractor is designed for use with a solid material containing an extractable component and includes a plurality of adjacent chambers each formed to contain a liquid solvent bath for extracting the component from the material and a continuous conveyor for displacing the material through the chambers. Partitions are used to define substantially vertical entryways for the conveyor at one side of the chambers and substantially vertical exitways for the conveyor at the opposite side of the chambers thus maintaining between the entryway and exitway of each container a quiescent solvent surface which is decanted for removal of solvent and dissolved component. A single continuous conveyor is used and the return leg of the conveyor is structured to carry out a final percolation-type extraction of the extractable component.

Abstract: A system for effecting a sharp separation from tar sands of the large weight fraction of coarse materials present therein and for recovering bitumen, or tar, from the remaining product, wherein, as a first step, finely divided particles of a tar sand are added to a liquid hydrocarbon solvent in an agitation zone to form a dilute solution of the bitumen component which is agitated to maintain both the coarse as well as the fine solid particles present in a well dispersed condition. This dispersion flows downwardly from the agitation zone and through a shallow conduit, generally rectangular in cross section and having an opening extending across its bottom portion over which the dispersion passes. During the short residence time of the dispersion over the opening, the coarse sand particles, which under the influence of gravity fall faster than the fines, selectively drop out of the dispersion and pass through the conduit opening into an underlying sand-receiving chamber.

Abstract: An improvement in a method for maintaining swimming pool water fit for use and apparatus for implementing same that is cyclical and that requires minimal amounts of treatment chemical, such method including introducing into such body of water an amount of selected accepted inhibiting chemical sufficient to raise the concentration of such chemical to a value within an established range known to destroy or inhibit the growth of any contaminant, then recirculating such body of water until the concentration of such chemical diminishes to a low point; then repeating the introduction step and the recirculation step several times with the cycle completed by the introduction of an amount of the order of twice the amount of the treatment chemical introduced at each preceding introduction step so as to dramatically change or shock the pool environment followed by recirculating such body of water until the concentration diminishes to a low point and then repeating the cycle; the apparatus for dispensing the treatment ch

Abstract: A chlorinator for swimming pools in which a quantity of granular dry crystals of chlorine is interposed in a bypassed stream of pool water for creating a chlorine concentrate in a container related to a mixing chamber such as to introduce a measured portion of the chlorine concentrate into the bypassed water prior to its returning to the swimming pool.