Abstract: Screens for conical mills and an improved gearbox and housing for such conical mills are shown and described. The screens are frusto-conically-shaped and include a tapered sidewall with a plurality of openings in the sidewall that may be of uniform size. Each opening is separated from adjacent openings by spacing distances which are shorter at the top of the tapered sidewall and longer at the bottom of the tapered sidewall to thereby reduce the residence time of the powder being milled at the top of the tapered sidewall and to increase the residence time of the powder being milled at the bottom of the tapered sidewall.

Abstract: Screens for conical mills and an improved gearbox and housing for such conical mills are shown and described. The screens are frusto-conically-shaped and include a tapered sidewall with a plurality of openings in the sidewall that may be of uniform size. Each opening is separated from adjacent openings by spacing distances which are shorter at the top of the tapered sidewall and longer at the bottom of the tapered sidewall to thereby reduce the residence time of the powder being milled at the top of the tapered sidewall and to increase the residence time of the powder being milled at the bottom of the tapered sidewall.

Abstract: Low haze or transparent thermoplastic polyolefinic resins have at least one colorant or pigment uniformly distributed therein. The compositions contain a polypropylene material and a second polyolefin comprising copolymer or homopolymer of ethylene or butene. The compositions can be formed into useful mold-in color panel for automotive and other use.

Abstract: A biocompatable multi-layer article suitable for use in blood oxygenation is disclosed. The article is made up of a microporous polypropylene tube, a perm-selective, water vapor impermeable, carbon dioxide and oxygen permeable, homogeneous layer directly adhered to the polypropylene tube and active heparin linked through a covalent bond to the permselective layer. The polypropylene tube has an inside diameter from 240 to 400 .mu.m, a wall thickness from 10 to 50 .mu.m, and a porosity from 20 to 80 percent. The perm-selective layer is a polysulfone which has the structure ##STR1## where R is an alkyl group having 16 carbon atoms and n is 3,500 to 35,000. A method for producing a biocompatible multi-layer article suitable for use in blood oxygenation is also disclosed. The method involves the steps of immersing a microporous polypropylene tube which has an inside diameter from 240 to 400 .mu.m, a wall thickness from 10 to 50 .mu.

Abstract: Asymmetrical layered structures such as asymmetrical films are disclosed. The main body section contains a multitude of pores (voids). A thin surface skin is free of pores. The entire structure is fabricated from a polyalkylene sulfone resin in which the alkylene moiety contains 6 to 18 carbon atoms. Processes for preparing the structures also are disclosed. The structures are semi-permeable to gases and are used as membranes to enrich the oxygen content of oxygen/nitrogen mixtures.

Abstract: Asymmetrical layered structures such as asymmetrical films are disclosed. The main body section contains a multitude of pores (voids). A thin surface skin is free of pores. The entire structure is fabricated from a polyalkylene sulfone resin in which the alkylene moiety contains 6 to 18 carbon atoms. Processes for preparing the structures also are disclosed. The structures are semi-permeable to gases and are used as membranes to enrich the oxygen content of oxygen/nitrogen mixtures.

Abstract: An electrochemical system using a flow-through electrode design employing a dual separation method to lower electrode poisoning due to large chemical species and interference current due to small electroactive species is disclosed. The system includes a fluid inlet to a reaction chamber and a fluid outlet from the chamber, with the chamber in contact with an electrode system. The electrode is protected from poisoning and interference by a membrane system comprising a semipermeable membrane having well defined pore ranges therethrough which allow diffusion of only selected size small molecules. A unique sample stream flow control coupled with the size selective membrane combine to remove large, or macromolecule poisoning species and substantially reduce small species interference at the active surfaces of the electrode means.

Abstract: This invention relates to a glass electrode structure. More specifically, the present invention relates to a glass electrode having a curved sensor tip for use in determining gas in an electrochemical membrane diffusion cell.

Abstract: An inline magnetic mixer for flowing fluids. A magnetic particle is contained within a flow tube through which a fluid passes. A coil made of electrically conductive material is positioned in close proximity to the flow tube and outside the flow tube. A low voltage, oscillating electrical supply energizes the coil. This sets up an oscillating magnetic field within the flow tube which causes the magnetic particle to oscillate longitudinally within the flow tube, thereby mixing the fluid stream passing through the flow tube.