Abstract: A gas permeable package for a preservative agent is fabricated from a material which includes a support having pores therein sufficiently large to permit passage of gas therethrough but small enough to retain a preservative agent. There is a conformal, hydrophobic and oleophobic coating on the porous support member. The coating includes a fluoroacrylate based polymer.

Abstract: A process for preparing charge modified filtration media including the steps of forming a filtration microporous or macroporous membranous or nonmembranous medium structure having internal and external surfaces and including a quaternizable nitrogen containing polymer exposed at the internal and external surfaces, permanently charging the exposed quaternizable nitrogen, and rendering the polymer insoluble in solution and permanently adhered within the filtration medium structure.Charge modified filtration media including a filtration medium structure as described having internal and external surfaces, characterized by a quaternizable nitrogen containing polymer exposed at the internal and external surfaces and having permanently charged quaternizable nitrogen. The quaternized nitrogen containing polymer is insoluble in solution and permanently adhered within the filtration medium structure.

Abstract: Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.

Abstract: A flexible inflatable filter assembly or device is provided in pouch or sleeve form for filtration of fluid comprising at least one fluid porous dead-end filter panel located internally within the pouch or sleeve with the opposite end edges of the filter panel sealed respectively to first and second polymer film fluid-barrier panels that form the pouch or sleeve so that the respective pouch or sleeve is divided into separate internal chambers, one of which may serve for collection of permeate fluid. The device has a flat two-dimensional form when empty but can assume an inflated three-dimensional form when containing fluid under pressure. The device being constructed of sterilizable thin plastic film, can be cut into transverse segments (for purposes of analysis, further processing, etc.) which can be a segment comprising each filter panel or a segment containing a liquid or non-liquid fluid permeate.

Abstract: Porous blended polymer (polyethersulfone, phenoxy resin) filtration membranes are provided which are useful for filtering macromolecules or particles from fluids. The invention also concerns a process for filtering matter from a fluid, employing the membranes.

Abstract: A method and a system are provided for protecting patients and equipment from the damaging effects of stray laser light emissions. Porous barrier materials are selected to have a pore geometry functionally related to the wavelength of emitted laser so as to cause destructive interference of the light beam when the beam encounters the porous material.

Abstract: Microporous filtration membranes are provided which are useful for absorbing or adsorbing cationic atoms, molecules or particles from liquids or gases. The invention also concerns novel strongly acidic copolymer solutions capable of crosslinking, and a process for preparing such solutions and making strongly acidic or anionic charge modified microporous filtration membranes therefrom. The copolymer of the solutions is synthesized from 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and either N-(isobutoxymethyl)acrylamide (IBMA) or 2-hydroxyethyl methacrylate (HEMA).

Abstract: This invention relates to macromolecular transfers, gel electrophoresis, and blotting methods involving polyaldehyde activated microporous membranes.

Abstract: Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.

Abstract: An activated microporous membrane is provided, having aldehyde functional groups on its inner and outer surfaces. The aldehyde functionality on all surfaces provides for effective covalent bonding to the membrane by amine containing materials. The activated membrane can be made of a polysulfone/polyacrolein mixture or a polysulfone microporous membrane treated with a polyacrolein solution.

Abstract: This invention is directed to a membrane-type filter device. Vents located opposite the hydrophilic membrane remove entrapped gases in the inlet chamber of the housing. There are preferably two such vents on either end of the inlet chamber, of which the corners are preferably non-rectangular, and which remove entrapped gases from the fluid without regard to filter device orientation.

Abstract: Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.

Abstract: An activated microporous membrane is provided, having aldehyde functional groups on its inner and outer surfaces. The aldehyde functionally on all surfaces provides for effective covalent bonding to the membrane by amine containing materials. The activated membrane can be made of a polysulfone/polyacrolein mixture or a polysulfone microporous membrane treated with a polyacrolein solution.

Abstract: An arterial blood filter assembly (10) for removing undissolved gases and foreign bodies, particles, clots, etc., from blood flowing through the assembly (10) includes a housing (34) having an inlet (38) and outlet (44) and a vent (48) for venting undissolved gases from the housing (34). A filter media (60) is supported within the housing (34). The assembly (10) includes a blood flow dividing mechanism disposed between the inlet (38) and filter media (58) to divide blood flow from the inlet (38) into a plurality of spaced inlet streams flowing over and down the outer boundary of the filter media (52) into the tapering space between the media and housing wall, which causes the streams to spread sideways and meet, forming upward-flowing streams which carry the entrained bubbles upward, to the channels in the housing top (80) which direct the air bubbles to the vent (48).

Abstract: The filter device is for filtering liquids and has a reservoir member for receiving the liquid to be filtered and a spout member for exit of the liquid after it is filtered, the spout member being assembled to the reservoir member with a filter disc therebetween. Each of these members has an annular ceramic magnet, these ceramic magnets being adjacent each other when the members are assembled whereby the magnetic attraction sealingly clamps the filter disc between the members. In accordance with the invention, the annular ceramic magnet of the reservoir member is completely enclosed within a closed annular cavity in the organic plastic of the reservoir member, the annular magnet being of smaller size than the annular cavity; and the annular ceramic magnet of the spout member is completely enclosed within a closed annular cavity in the organic plastic of the spout member, this annular magnet also being of smaller size than the annular cavity in which it is enclosed.

Abstract: The starting materials for the practice of the present invention are (1) one or more organic monomers or oligomers which upon irradiation very rapidly undergo a polymerization reaction to form a solid polymer; and (2) a liquid vehicle in which the one or more organic monomers or oligomers are soluble but in which the polymer formed is insoluble. For the manufacture of microporous membrane in accordance with the invention the monomers or oligomers are dissolved in the liquid vehicle, the resulting solution is formed into a thin layer, and the thin layer of the solution is then irradiated as with ultraviolet or electron beam radiation whereupon the rapid polymerization reaction immediately ensues and the polymer formed immediately segregates from the vehicle thereby resulting in microporous membrane from which the vehicle can be removed as by evaporation or washing.

Abstract: The disposable filter device of the invention has a housing with a fluid inlet chamber and fluid outlet chamber separated by a hydrophobic filter and having a hydrophilic filter on the inlet chamber side of the hydrophobic filter. In the liquid aspirating system, the disposable filter device is connected between the liquid collection container and the inlet to the aspirator, the hydrophobic filter functioning to prevent the passage of any liquid to the aspirator and the hydrophilic filter functioning to prevent a large accumulation of liquid on the inlet chamber of the filter device and to better assure against any spillage of liquid in the inlet chamber during replacement of the device.

Abstract: A disposable filter device having a plastic housing with inlet and outlet chambers separated by a filter disc sealed within the housing, the housing being readily disassemblable after use to remove the filter disc for identification or analysis of the material filtered from the fluid.

Abstract: A cast film, sheet or coating of a crosslinked graft copolymer of an organic polymeric substrate and an ethylenically unsaturated organic monomer is formed by effecting the graft copolymerization while the polymeric substrate and monomer are in solution in a solvent thereby to form the crosslinked graft copolymer in the form of a gel, subjecting the gel to high shear forces to convert it to a thixotropic suspension, forming the thixotropic suspension into a layer, and removing the solvent from the layer.