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| Number | Title | Issue Date |
| 5344566 | Deleading wastewater reduction process This invention provides a fast and efficient method and process to remove lead from washwater streams that are part of the deleading process. By employing a two step process using epsom salts as a precipitating chemical to convert dilute lead concentratio... | 09/06/1994 |
| 5328613 | Polymer membranes for separation processes Semi-permeable microporous polymer bodies, such as porous plates or membranes for separation processes, are provided, these being made of durable high-temperature thermoplastics, eg., a liquid crystal polymer, by a process comprising melt-mixing the polym... | 07/12/1994 |
| 5308484 | Filtering apparatus for synthetic thermoplastics material A filtration apparatus for thermoplastic synthetic plastics material comprises a housing (1) in which a carrier body (4) formed by a piston, for two screen nests (8,9) is bearingly supported for displacement in direction of its axis. In the filtration pos... | 05/03/1994 |
| 5306427 | Low pressure feed membrane separation process A process is set forth for the separation of one or more, more permeable components from one or more, less permeable components in a feed stream. The process suggests two membrane separation stages in series wherein the feed is introduced into the low pre... | 04/26/1994 |
| 5304304 | Filter cloth arrangement in a rotating filter In a rotating filter a filter cloth (18) is arranged outside a filter skeleton (34, 36). The filter cloth is provided with at least one bending resistant element (37, 38) extending through a pocket (49) arranged in or on the filter cloth (18) to restrain ... | 04/19/1994 |
| 5303749 | Gas cylinder handling process and assembly A method and assembly for treating hazardous and/or unknown fluids either liquids or compressed gases contained in a gas cylinder (12) having a cylinder body (14) and a removable fixture (16). The assembly (10) includes a tubular housing (18) having an op... | 04/19/1994 |
| 5298161 | Apparatus for cleaning the working liquid of an EDM or ECM machine The apparatus includes at least one membrane filter (32) for filtering a machining liquid which has been contaminated by its use in electroerosive or electrochemical machining of workpieces. The apparatus also includes a device for cyclical cleaning of th... | 03/29/1994 |
| 5296145 | Apparatus and method for supercritical fluid extraction An apparatus for supercritical fluid extraction incorporates a removable extraction cartridge which in operation has insignificant pressure difference between its inside and outside walls. In one embodiment, the extractor includes a fraction collector for... | 03/22/1994 |
| 5296150 | Water oil separator An apparatus for separating at least one selected medium from a liquid influent stream includes an assembly for dividing the influent stream into a plurality of smaller streams at an interface and means for filtering the smaller streams as they each flow ... | 03/22/1994 |
| 5296148 | Reverse osmosis water purifier A water purification apparatus utilizing a reverse osmosis cartridge which supplies a measured amount of potable water to substantially fill an open top pitcher of known desired size. This free-standing apparatus includes an electric pump which withdraws ... | 03/22/1994 |
| 5294339 | Ultrafiltration separator Ultrafiltration separator with a membrane made of a stainless steel or titanium wire weave with a wire diameter of less than 0.02 mm, exhibiting more than 2000 picks, i.e. more than 2000 pores per inch, with mesh openings less than 0.004 mm in size, where... | 03/15/1994 |
| 5294345 | Membrane module assembly A membrane module assembly adapted to provide a flow path for the incoming feed stream that forces it into prolonged heat-exchanging contact with a heating or cooling mechanism. Membrane separation processes employing the module assembly are also disclose... | 03/15/1994 |
| 5294346 | Composite microporous membranes The composite membrane is disclosed having a microporous support which is coated with a polymer composition and a contact adhesive layer applied to said polymer. A process for making and a process for using the membrane is also disclosed.... | 03/15/1994 |
| 5294338 | Porous polyethylene hollow fiber membrane of large pore diameter, production process thereof, and hydrophilized porous polyethylene hollow fiber membranes Disclosed is a porous polyethylene hollow fiber membrane of large pore diameter which have (a) rectangular pores formed by microfibrils that are oriented in the lengthwise direction of the fibers and joint portions that are composed of stacked lamellae, t... | 03/15/1994 |
| 5290448 | Polyacrylonitrile membrane An asymmetric semipermeable membrane for dialysis and/or ultrafiltration is composed of a copolymer of acrylonitrile and acrylic ester and an ionic or ionizable monomer in the form of a hollow fiber. The copolymer is composed of 90.50 to 95.00 wt. % acryl... | 03/01/1994 |
| 5288712 | Pervaporation process employing permeate recycle The selectivity of a membrane pervaporation aromatics/non-aromatics separation process is unexpectedly improved by the recycle of permeate to the separation process for co-processing with fresh feed. The selectivity obtained is greater than that achieved ... | 02/22/1994 |
| 5284583 | Fiber membrane elements and modules and methods of fabrication for fluid separation A fluid mixture separation membrane element (10) includes elongated hollow pressure-resistant nonpermeable transport arteries (12) and a plurality of flexible hollow fibers (14) of semipermeable material having internal flow channels (20). The hollow tubu... | 02/08/1994 |
| 5282964 | Boreside feed hollow fiber membrane device The present invention is a bore-fed hollow fiber membrane device which possesses improved shellside countercurrent flow distribution. More specifically, the hollow fiber membrane bundle has a radial Peclet number of about 30 or lower which results in impr... | 02/01/1994 |
| 5282965 | Membrane filter for liquids and filtering device using the same Objects of the present invention are to provide a membrane filter for liquids which is used in microfiltration or ultrafiltration of liquids such as chemicals, water, and the like and to provide a filtering device using the membrane. The membrane is a mem... | 02/01/1994 |
| 5282966 | Package for permeation separation device The invention is a membrane separation device having a housing which serves the dual role of a lightweight, impact-resistant shipping container and a recloseable vessel for the separation membranes. The housing reduces handling of the membranes, facilitat... | 02/01/1994 |
| 5282971 | Positively charged polyvinylidene fluoride membrane A filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing positively charged quaternary ammonium groups covalently bonded to the membrane, and a method of using the filter medium to treat a composition, particularl... | 02/01/1994 |
| 5282969 | High pressure feed membrane separation process A process is set forth for the separation of one or more, more permeable components from one or more, less permeable components in a feed stream. The process suggests three membrane separation stages in series and is suitable for high pressure feed applic... | 02/01/1994 |
| 5281337 | Membrane separation process Membrane separation process is improved by use, as a support membrane, of (i) a polyacrylonitrile membrane on which at least a portion of the surface --CN groups have been hydrolyzed to --COOH groups or (ii) a membrane formed of polyacrylonitrile and poly... | 01/25/1994 |
| 5281343 | Vacuum filtration system and method of filtering pulp fibers from pulp slurry using the same A method and apparatus for filtering pulp fibers from a pulp slurry, using a combination of vacuum, hydrodynamic and hydrostatic forces in order to achieve a more effective deposition of pulp fibers onto the filter surface and enhanced flow of filtrate th... | 01/25/1994 |
| 5279747 | Decontamination extraction process for treatment of oily solids A process for the removal of hydrocarbons from contaminated oily solids performed under atmospheric conditions by utilizing a single processing zone wherein multiple processing steps are carried out to remove contaminants. The steps include loading contam... | 01/18/1994 |
| 5279732 | Fluid conditioning device A fluid conditioning device having a housing containing a fluid inlet and outlet and a removable fluid conditioner through which fluid passes from the inlet to the outlet and which removes matter from and/or adds matter to the fluid, and an improved seal ... | 01/18/1994 |
| 5277806 | Liquid clarifier A liquid clarifier in the form of an enclosure in which a conical filter membrane is mounted. An inlet is mounted to the enclosure below the conical filter membrane and an outlet is mounted to the enclosure above the membrane so than an upflow of liquid i... | 01/11/1994 |
| 5277799 | Pump compartment screening arrangement for a tank A screening arrangement is disclosed for protecting the pump compartment of a tank from the entrance of debris including a holder frame mounted in the tank, slidably receiving therein a pair of screens aligned with each other. The outside screen is remove... | 01/11/1994 |
| 5275725 | Flat separation membrane leaf and rotary separation apparatus containing flat membranes The present invention provides a flat separation membrane leaf, which is characterized by consisting of a flat membrane support comprising an inner layer having a coarse structure and surface layers comprising a nonwoven fabrics having a dense structure, ... | 01/04/1994 |
| 5275726 | Spiral wound element for separation An improved spiral wound element for separations is disclosed wherein the improvement comprises using as the feed/retentate space one or more layers of a material having an open cross-sectional area in the range 30 to 70% and as the permeate spacer materi... | 01/04/1994 |
| 5275644 | Steam separating apparatus A liquid-vapor separator for two-phase fluids in general and specifically a steam-water separator in a steam drum of a steam generator includes axial or radial spinner blades to create a centrifugal motion which causes liquid to be forced outward against ... | 01/04/1994 |
| 5275735 | Method and apparatus for dissolving gas in liquid, e.g., in wastewater collection and transmission systems A method and the apparatus for the dissolving gas in liquid, in particular, dissolving oxygen and elimination of variable flow rates in wastewater collection and transmission systems that provides the means to stop the generation of toxic chemicals, allow... | 01/04/1994 |
| 5271851 | Integrated treatment system for refinery oily sludges A process for the treatment of refinery oily sludges to produce an oily fraction that is reprocessed in the refinery into (i) salable products and (ii) a solid residue meeting environmental regulatory agency requirements for disposal in non-hazardous soli... | 12/21/1993 |
| 5269930 | Apparatus and method for supercritical fluid extraction To collect analyte in a supercritical fluid extraction process, the extractant flows to a collection container under pressure. In one embodiment, the collection container contains collection solvent through which the extractant flows to partition analyte.... | 12/14/1993 |
| 5268101 | Microprobes aluminosilicate ceramic membranes Methods have been developed to make mixed alumina-silicate and aluminosilicate particulate microporous ceramic membranes. One method involves the making of separate alumina and silica sols which are then mixed. Another method involves the creation of a co... | 12/07/1993 |
| 5268102 | Apparatus and method for supercritical fluid extraction To supply supercritical fluid to an automatic supercritical fluid extractor and collect extract from the extractor, sample holding cartridges are lifted one by one in series by an elevator plug into a pressure chamber. An inlet at the top of the cartridge... | 12/07/1993 |
| 5268103 | Apparatus and method for supercritical fluid extraction To avoid deposits on the restrictor that channels extractant into a collector, a heated capillary tube pressure release restrictor, has a thermally insulated outlet end in a collecting trap substantially colder than the capillary tube. The restrictor is h... | 12/07/1993 |
| 5266212 | Purification of cyanide-free copper plating baths A process by which organo phosphonate and cupric ions may be removed from an electroplating bath containing contaminants. Excess acetate salt content causes precipitation of a copper/organo phosphonate (HEDP) precipitate which may be removed leaving the c... | 11/30/1993 |
| 5265734 | Silicon-derived solvent stable membranes A composite membrane comprises a substrate made from a polymer selected from copolymers and homopolymers of ethylenically unsaturated nitriles, which substrate has preferably first been treated with a pore protector in absence of curing agents and catalys... | 11/30/1993 |
| 5266195 | Spiral wound separation device and method of making same A sandwich of a permeate fabric material within a folded sheet of semipermeable membrane is spirally wound together with a sheet of porous feed pathway material about a mandrel which, upon its removal, provides a central hollow region in the wound element... | 11/30/1993 |
