Abstract: A process for preventing polymeragglomeration and for controlling the density of copolymer produced by an alpha-olefin copolymerization process in a polymerization reactor, wherein the ratio of the flow rates of introduction of the comonomer(s) to the monomer is kept constant.

Abstract: A process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a metallocene catalyst in that the polymerization is preformed in the presence of a process aid additive selected from at least one of 1) a polysulfone copolymer, 2) a polymeric polyamine, or 3) an oil-soluble sulfonic acid.

Abstract: A process for preventing polymeragglomeration and for controlling the density of copolymer produced by an alpha-olefin copolymerization process in a polymerization reactor, wherein the ratio of the flow rates of introduction of the comonomer(s) to the monomer is kept constant.

Abstract: A process for the gas-phase (co-)polymerisation of olefins in a fluidised bed reactor using a metallocene catalyst. The polymerisation is performed in the presence of a process aid additive.

Abstract: A process for introducing a solid catalyst particle feed into a fluidised or agitated vessel utilising a feed delivery device, a vertical feed dilution pipe and a feed injection pipe connected to the vessel, the process including the steps of: (a) introducing the solid catalyst particles feed from the feed delivery device into the vertical feed dilution pipe, (b) diluting the solid catalyst particles feed by letting the solid particle reaching by gravity their terminal velocity in the feed dilution pipe, (c) introducing the diluted solid catalyst particles feed into the injection pipe and mixing it with conveying gas, and introducing the gas conveyed diluted solid catalyst particles feed into the vessel.

Abstract: The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a desurging or disengagement chamber (3) mounted above the said cylinder, characterized in that the fluidized bed occupies at least all of the cylinder with a vertical side wall of the reactor.

Abstract: A continuous process for gas phase coating of polymerisation catalyst. The polymerisation catalyst is introduced in a gas phase plug flow type reactor wherein it is submitted to polymerisation conditions in the presence of at least one monomer such that at least 95% by weight of the produced coated catalysts have a coating yield comprised between 0.5 to 2 times the average coating yield.

Abstract: The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a desurging or disengagement chamber (3) mounted above the said cylinder, characterized in that the fluidized bed occupies at least all of the cylinder with a vertical side wall of the reactor.

Abstract: The present invention relates to a process for continuous gas phase polymerization of olefin(s) in a reactor containing a fluidized bed, consisting of a cylinder with a vertical side wall and of a desurging or disengagement chamber mounted above the said cylinder, characterized in that the fluidized bed occupies at least all of the cylinder with a vertical side wall of the reactor.

Abstract: The axial thrust exerted on a rotating shaft, such as the shaft of a turbomachine rotor, is measured by a device comprising a resilient washer sandwiched between two flange members disposed around the shaft so that the axial thrust will cause axial compression of the washer between the two flange members, and displacement-measurement probes secured to a fixed structure for measuring the displacements of the flange members so that the axial thrust can be determined from the difference between the displacements and corresponding to the change in thickness of the resilient washer.

Abstract: The present invention relates to a process for introducing a solid catalyst into a gas-phase olefin polymerization reactor. It comprises in particular storing the catalyst in the form of a dry powder in a hopper, withdrawing from the hopper a measured amount of the said catalyst, introducing the said amount of the catalyst and a liquid hydrocarbon into a mixing chamber, mixing the said catalyst with the said liquid hydrocarbon so as to form in the said chamber a suspension of the entrained catalyst with the said liquid hydrocarbon, and introducing the said suspension into the said reactor. In a preferred form, the liquid hydrocarbon is continuously introduced into the chamber and forms a continuous stream to which is added the measured amount of the catalyst and which flows into the reactor.

Abstract: For the purpose of taking measurements within a V-engine while it is running during development of the engine, a first of the two banks of piston and cylinders defining the V is provided with measurement sensors and is arranged to run normally performing the normal cycle of induction, compression, combustion, and exhaust, and each cylinder of the second bank has its fuel inlet closed and its combustion chamber open to the atmosphere whereby the second bank functions without compression and combustion and is effectively inert, the second bank serving as a mechanical support for conveying signals from the measurement sensors.

Abstract: A process of making glass beads which comprises the steps of forming a fluid medium comprising an aqueous liquid having glass-forming material therein at least most of which is dissolved in the aqueous liquid, forming drops of such fluid medium, and converting the drops to glass beads by causing the drops to travel in separated condition first through a firing zone at glass-forming temperature to cause evaporation of liquid and formation of glass from the glass-forming material, and then through a cooling zone to cause the glass to solidify.

Abstract: A process for the preparation of expansible beads which are convertible by firing into cellular glass bodies, such process comprising the steps of preparing a slip having a liquid medium continuous phase and a disperse phase, the slip containing particles of glass or glass-forming material, a cellulating agent, and a binder, the disperse phase of the slip including at least most of the particles, dividing the slip into drops, and subjecting the drops while in divided condition to a heat treatment including heating and cooling stages so as to cause evaporation of liquid from the drops and conversion thereof into self-sustaining beads in which the glass or glass-forming particles are held together by the binder and which contain the cellulating agent or gas derived therefrom.

Abstract: Respiratory apparatus for a free underwater diver comprising a sealed and deformable respiratory bag in pressure equilibrium with the exterior and into which the diver inspires and expirates. The bag communicates on the one hand with an absorbant means for CO.sub.2 and on the other hand, with bottles of oxygen and a compressed neutral gas, the communication with the bottle of neutral gas being effected through a valve secured to a plate on which the wall of the bag acts when the volume thereof is reduced. At least one sensor of the partial pressure of oxygen is disposed in the bag and delivers a voltage signal proportional to the pressure, and an electrovalve is placed in a circuit connecting the oxygen bottle to the bag.

Abstract: A vehicle shock absorber of the hydraulic cylinder and piston type which includes a control valve for limiting pressure of the hydraulic fluid during compression movement to control the damping force of the device in accordance with rate of compression movement above a predetermined rate. The damping force is limited during expansion movement to provide good road-holding ability for the vehicle.

Abstract: A device for determining the nature of relationships between on the one hand data peculiar to one unit or a group of separate units, and on the other hand data of another unit or another group of separate units pertaining to the same assembly, includes a transparent support corresponding to each unit or group of units, each support being arranged by means of a matrix of addresses, wherein on the support corresponding to each unit or groups of separate units are inscribed, at any address, corresponding to the data peculiar to the other units or group of separate units, one or more symbols distinctive of each nature of relationship between the data peculiar to the unit or groups of separate units corresponding to each support and the data peculiar to the other units or groups of units of the assembly. This permits the symbols to be simultaneously read when superimposing the cards corresponding to the relationship to be studied.