Abstract: A biosafety cabinet includes one or more air filters below the work surface and a system for holding, sealing, replacing and disposing the air filters through the work access opening of the biosafety cabinet. The air filters under the work surface of the biosafety cabinet capture particulates entering the cabinet from the exterior environment and the particulates within the cabinet's work chamber. Instead of a mechanical clamp, the perimeter of the air filters are sealed using a gasket and a tape, eliminating the accumulation of the contaminants around mechanical clamps. The air filters may be accessed through the work access opening of the biosafety cabinet, packaged for disposal and removed from the biosafety cabinet without being exposed to the exterior environment. A filter cover with an adhesive surface is used to cover and lift the used, contaminated air filter within the biosafety cabinet.

Abstract: A biosafety cabinet device includes one or more walls forming a housing, a work area contained within the housing, a filter in fluid communication with the work area for filtering fluid passing through and exiting the work area. The filter includes a primary filtration surface through which a majority of fluid being filtered by the filter passes. A filter removal device is configured to couple to the filter. The filter removal device includes a rigid barrier layer and one or more handling mechanisms adjoined with the rigid barrier layer and extending distal to the rigid barrier layer. When the filter removal device is securely coupled to the filter, the rigid barrier layer extends substantially across a non-peripheral portion of the primary filtration surface of the filter and allows passage of fluid from the work area through the primary filtration surface of the filter.

Abstract: A canopy for a biological cabinet includes a plurality of openings, referred to as ports, covered by air dampers and designed to open and close as needed to reduce an overall volume of air required during normal operation. If the building exhaust system attempts to pull more air than is supplied by the cabinet, the intake dampers will open to allow room air in through the intake ports, thus helping the cabinet to maintain an acceptable level of intake airflow at its front access opening. If the building exhaust system does not pull a sufficient amount of air, the outlet damper will open and let the cabinet exhaust air escape through the outlet port, thus enabling the cabinet to maintain an acceptable level of intake airflow at its front access opening. The canopy may also include an internal air baffle that helps to capture the cabinet exhaust air and direct it out through the opening connected to the building exhaust duct.

Abstract: A biosafety cabinet includes one or more air filters below the work surface and a system for holding, sealing, replacing and disposing the air filters through the work access opening of the biosafety cabinet. The air filters under the work surface of the biosafety cabinet capture particulates entering the cabinet from the exterior environment and the particulates within the cabinet's work chamber. Instead of a mechanical clamp, the perimeter of the air filters are sealed using a gasket and a tape, eliminating the accumulation of the contaminants around mechanical clamps. The air filters may be accessed through the work access opening of the biosafety cabinet, packaged for disposal and removed from the biosafety cabinet without being exposed to the exterior environment. A filter cover with an adhesive surface is used to cover and lift the used, contaminated air filter within the biosafety cabinet.

Abstract: A biosafety cabinet includes at least one cable port disposed in a wall of the cabinet that allows small tubing and/or cables to enter the cabinet through the walls. The cable port eliminates problems associated with running the tubing and/or cables through an open door at the front of the cabinet. The cable ports enable the user to fully close the view screen door, while maintaining the ability to connect various tubes and/or cables to devices in the interior work area of the cabinet. The biosafety cabinet further includes a double wall configuration with negative pressure air space between the two walls. Air and byproducts or contaminants attempting to escape from the cabinet into the room or enter the cabinet from the outside environment is captured in the negative pressure area between the walls and transported directly to an air filter.

Abstract: A trefoil for a rotary kiln is provided that has at least three spoke-like refractory legs. Each one of the legs extends radially outwardly from a center of the trefoil; spans approximately from the kiln shell to the center of the kiln; is pre-formed outside of the kiln for installation as a single-leg unit; and has a mating surface that preferably is uniform and even, thereby lacking interlocking features. The mating surfaces of the legs abut one another at the kiln center to provide mutual support. An alignment member, such as a pair of longitudinal angles, are welded to the kiln shell to position the legs. A corresponding method of installing the trefoil is disclosed that includes positioning and shimming the first two legs at the 4 o'clock position and 8 o'clock position, and installing the third leg at the 12 o'clock position.

Abstract: A trefoil for a rotary kiln is provided that has at least three spoke-like refractory legs. Each one of the legs extends radially outwardly from a center of the trefoil; spans approximately from the kiln shell to the center of the kiln; is pre-formed outside of the kiln for installation as a single-leg unit; and has a mating surface that preferably is uniform and even, thereby lacking interlocking features. The mating surfaces of the legs abut one another at the kiln center to provide mutual support. An alignment member, such as a pair of longitudinal angles, are welded to the kiln shell to position the legs. A corresponding method of installing the trefoil is disclosed that includes positioning and shimming the first two legs at the 4 o'clock position and 8 o'clock position, and installing the third leg at the 12 o'clock position.

Abstract: A trefoil for a rotary kiln is provided that has at least three spoke-like refractory legs. Each one of the legs extends radially outwardly from a center of the trefoil; spans approximately from the kiln shell to the center of the kiln; is pre-formed outside of the kiln for installation as a single-leg unit; and has a mating surface that preferably is uniform and even, thereby lacking interlocking features. The mating surfaces of the legs abut one another at the kiln center to provide mutual support. An alignment member, such as a pair of longitudinal angles, are welded to the kiln shell to position the legs. A corresponding method of installing the trefoil is disclosed that includes positioning and shimming the first two legs at the 4 o'clock position and 8 o'clock position, and installing the third leg at the 12 o'clock position.

Abstract: A trefoil for a rotary kiln is provided that has at least three spoke-like refractory legs. Each one of the legs extends radially outwardly from a center of the trefoil; spans approximately from the kiln shell to the center of the kiln; is pre-formed outside of the kiln for installation as a single-leg unit; and has a mating surface that preferably is uniform and even, thereby lacking interlocking features. The mating surfaces of the legs abut one another at the kiln center to provide mutual support. An alignment member, such as a pair of longitudinal angles, are welded to the kiln shell to position the legs. A corresponding method of installing the trefoil is disclosed that includes positioning and shimming the first two legs at the 4 o'clock position and 8 o'clock position, and installing the third leg at the 12 o'clock position.

Abstract: A refractory adhesive and filler paste composition is described which can be extruded, trowelled or parged onto a refractory surface. The composition can be used to adhesively secure shaped refractory articles together or used as a filler. The composition contains refractory grain particles having critical size limitations and a non-aqueous binder system which includes an unsaturated drying oil such as tung or linseed oil and an organic solvent such as naphtha. The composition may be premixed and packaged in a caulking gun cartridge and applied by extrusion.

Abstract: Disclosed is a process and test kit for determining the reliability of a barrier to microorganism passage. In accordance with the process, a multiplicity of non-self replicating particles is introduced into a first gas volume, disposed on one side of a barrier to particle movement, and particle traps are placed in a second gas volume on the other side of the barrier. The particles carry a marker substance such as a toxin for a selected microorganism or a component needed for growth of a selected microorganism. The barrier is operated and the contents of the trap are assayed for the amount of the marker substance present in association with particles which crossed the barrier by adding the marker substance in the trap to a culture of the selected microorganism and detecting the effect of the marker substance on the culture. Finally, the results of the assay are compared to a standard to determine the number of trapped particles which crossed the barrier.

Abstract: A sweeper assembly for use with escalators includes a frame having a pivoted end structure on which a weighted bar is fixed to press a polishing pad adjacent a bristle element against the moving surfaces of the escalator. A vacuum cleaner is then rendered operative to draw the debris thus loosened into a nozzle deployed adjacent the bristle element.

Abstract: A control for a treadle activated machine tool having a driving power and a mechanical treadle linkage connecting the treadle to the driving power. The control comprises at least one sensor for sensing the presence of an operator's hand remote from a work area of the machine tool and an interrupt for selectively interrupting the treadle linkage in response to a signal indicating the absence of the operator's hand from the sensor.

Abstract: Satisfactory bonding of refractory aggregate is obtained by providing the aggregate with at least 5.0% by weight of free CaO of minus 200 mesh (Tyler Standard Sieve) particle size, adding a small amount of a lithium compound to the aggregate and heating to a temperature of about 450.degree. C. The modulus of rupture at room temperature of a brick made from dead burnt dolomite aggregate containing a fine fraction providing the finely divided CaO and the lithium compound additive and fired to 450.degree. C. is well above 400 psi and may be substantially equivalent to that of a brick made of the same aggregate without the lithium compound additive and fired to 1200.degree. C. The invention comprises the method of increasing the low temperature bonding strength of refractory aggregates, the unfired mixtures of the refractory aggregate containing the requisite CaO and the lithium compound with or without temporary liquid or solid binding agents, and the fired products made therefrom.

Abstract: An unsaturated halogenated or non-halogenated polyester resin composition for open lay-up moulding and containing styrene as an agent for cross-linking during curing additionally contains 0.1 to 5% by weight, based on the total weight of the composition, of at least one C.sub.18-40 .alpha.-olefine compound which is theoretically capable of taking part in the cross-linking reaction.When the composition contains a non-halogenated polyester resin, then the .alpha.-olefine compound itself serves to restrict styrene evaporation from the composition.For halogenated polyester resin compositions, the .alpha.-olefine, although not usually by itself providing such a marked restriction of styrene evaporation, does allow incorporation into the composition of a waxy compound in an amount sufficiently large to achieve the desired styrene evaporation restriction without deterioration of the adhesion properties of the composition during lay-up.

Abstract: This invention is concerned with an aqueous liquid composition comprising unsaturated monomers including (1) magnesium diacrylate and/or calcium diacrylate, (2) a polyol monoacrylate selected from hydroxyethyl acrylate and hydroxypropyl acrylate, and (3) a polyethylenically unsaturated monomer copolymerizable with (1) and (2) to produce covalent cross-linking bonds in the copolymer besides the ionizable magnesium bonds. The weight ratio of (3) to the sum of (1) and (2) is in the range of about 3:97 to about 5:95. Examples of monomers that can be used as part or all of component (3) include N,N'-methylene-bis-acrylamide and ethylene glycol diacrylate.

Abstract: This invention is concerned with a method of grouting sewer conduits by using an aqueous liquid composition comprising unsaturated monomers including (1) magnesium diacrylate, (2) an alkali metal (sodium or potassium) monoacrylate in a weight ratio of (1):(2) from about 90:10 to about 70:30, and (3) a polyethylenically unsaturated monomer copolymerizable with (1) and (2) to produce covalent cross-linking bonds in the copolymer besides the ionizable magnesium bonds. The weight ratio of (3) to the sum of (1) and (2) is in the range of about 3:97 to about 5:95. Examples of monomers that can be used as part or all of component (3) include N,N'-methylene-bis-acrylamide and ethylene glycol diacrylate.

Abstract: A multi-level, animal inhalation toxicology research chamber system is disclosed. It has an enclosed airtight chamber defining a central enclosure with vertically extending inlet and outlet plenums at its opposite ends. A plurality of vertically spaced horizontally extending perforated shelves with underlying collection pans are provided for supporting laboratory animal cages vertically spaced on a plurality of levels. Air is distributed from the inlet plenum to the outlet plenum means through the animal cages in a horizontal direction. The collection pans prevent vertical fluid communication and the perforated shelves permit passage of animal waste into the collection pan, thereby preventing animals from contacting their own waste and preventing waste from falling on animals located beneath an upper cage.

Abstract: A sealing arrangement primarily for a sluice gate which comprises a frame and a door movable between an open position and a closed position in which it closes an opening in the frame and sealing faces of the door and the frame are in sealing engagement to prevent the flow of liquid through the opening. The sealing arrangement comprises an intermediate wedge section strip interposed between two side strips having inclined planar faces in contact with the inclined planar side faces of the intermediate strip. The intermediate strip is either arranged to bear against the door or secured to the frame, and either one of the side strips is secured to the frame or both side strips are arranged to bear against the door respectively.

Abstract: A movable scaffold for use in gaining access to the inside wall of an upright cylindrical tank such as a petroleum refinery reactor tower. The scaffold comprises a central frame having four radially extending, adjustable arm sets each connected to a scaffold platform, or cage, and hydraulically actuated to bring the platforms into working proximity with the inside tank wall. The scaffold platforms are each connected by cables received over sheaves at the top of the tank to winches outside the tank. Said winches are controllable to rotate the platforms within the tank, and/or to adjust the elevation of the platforms within the tank.