Abstract: An underwater hydroelectric turbine comprises a turbine housing having an inlet and an outlet, a central shaft extending axially inside the turbine housing, a self-contained, sealed front bearing unit for rotationally supporting a front end of the central shaft, and a self-contained, sealed rear bearing unit for rotationally supporting a rear end of the central shaft. The front bearing unit and the rear bearing unit each comprises a self-powered lubricant circulation system that draws a fraction of the mechanical power from rotation of the central shaft to circulate lubricant through each respective bearing unit. The turbine may have an equilibrium chamber for automatically balancing lubricant pressure inside a lubricant-containing chamber of the bearing chambers with ambient water pressure outside the bearing housing.

Abstract: The filtering molten metal injector system includes a holder furnace, a casting mold supported above the holder furnace, and at least one molten metal injector supported from a bottom side of the casting mold. The holder furnace contains a supply of molten metal. The mold defines a mold cavity for receiving the molten metal from the holder furnace. The molten metal injector projects into the holder furnace. The molten metal injector includes a cylinder defining a piston cavity housing a reciprocating piston for pumping the molten metal upward from the holder furnace to the mold cavity. The cylinder and piston are at least partially submerged in the molten metal when the holder furnace contains the molten metal. The cylinder or the piston includes a molten metal intake for receiving the molten metal into the piston cavity when the holder furnace contains molten metal. A conduit connects the piston cavity to the mold cavity.

Abstract: Disclosed is a molten metal injector system including a holder furnace, a casting mold supported above the holder furnace, and a molten metal injector supported from a bottom side of the mold. The holder furnace contains a supply of molten metal having a metal oxide film surface. The bottom side of the mold faces the holder furnace. The mold defines a mold cavity for receiving the molten metal from the holder furnace. The injector projects into the holder furnace and is in fluid communication with the mold cavity. The injector includes a piston positioned within a piston cavity defined by a cylinder for pumping the molten metal upward from the holder furnace and injecting the molten metal into the mold cavity under pressure. The piston and cylinder are at least partially submerged in the molten metal when the holder furnace contains the molten metal. The cylinder further includes a molten metal intake for receiving the molten metal into the piston cavity.

Abstract: The molten metal injector system includes a holder furnace, a casting mold supported above the holder furnace, and a molten metal injector supported from a bottom side of the mold. The holder furnace contains a supply of molten metal. The casting mold defines a mold cavity for receiving molten metal from the holder furnace. The injector projects downward into the holder furnace and is in fluid communication with the mold cavity. The injector includes a cylinder defining a piston cavity housing a reciprocating piston. The piston pumps molten metal upward from the holder furnace to the mold cavity. The cylinder further includes a molten metal intake for receiving molten metal into the piston cavity. The intake may be a valve or an aperture defined in the sidewall of the cylinder.

Abstract: The molten metal injector system includes a holder furnace containing a supply of molten metal. A casting mold is supported above the holder furnace. The mold defines a mold cavity for receiving molten metal from the holder furnace. One or more molten metal injectors is supported from the bottom side of the mold. The injector is in fluid communication with the mold cavity and includes a reciprocating piston for pumping molten metal upward from the holder furnace and injecting the molten metal into the mold cavity. The injector is partially submerged in molten metal when the holder furnace contains molten metal. The injector includes a molten metal intake for receiving molten metal into the injector. The molten metal intake is located below the surface of the molten metal in the holder furnace.

Abstract: The injector includes a cylinder defining a piston cavity housing a reciprocating piston for pumping molten metal from a holder furnace and injecting the molten metal into the mold cavity of a casting mold. The piston defines a molten metal intake for receiving molten metal into the piston cavity. A check valve is positioned in the molten metal intake defmed by the piston. The check valve is preferably a ball check valve. The cylinder further defines a fill conduit in fluid communication with the piston cavity. The fill conduit extends through a top wall of the cylinder and extends along an axis substantially parallel to the piston.

Abstract: A transmitter which includes N amplifiers connected together by a common signal input and which output to a common load. The transmitter also includes N identical series LC circuits, each connected between an amplifier output and the common load, with the common points between each inductance and capacitance connected together. The extremely modular nature of the device makes the transmitter easy to reconfigure if one of the amplifiers fails.

Abstract: The invention relates to a new material in thermoplastic resin.The new laminated material with a basis of thermoplastic resin according to the invention is characterized in that it is in the form of a skin with at least one smooth face (1a), and having at least one dense and compact layer of thermoplastic resin, which layer is free from any gaseous trapping, and a fibrous layer (1b) formed of thermoplastic resin fibers and being an integral part of the compact layer.The invention finds an application in the production of wall coverings and panels.

Abstract: An object to be packaged is suspended in an upwardly open mold whose walls are formed with an array of throughgoing perforations and lined with a gas-pervious sheet. A similarly perforated and lined cover is placed over the mold and foamable polyurethane material is poured into the mold through an elastic hose-like conduit connected to a filling aperture on the mold cover. This material expands within the mold completely filling the space around the object and thereby forms a fitted package around the object. The gas-pervious sheet material lining the mold may be a plurality of synthetic-resin panels formed of parallel inner and outer walls spaced apart by parallel webs defining between the inner and outer walls a plurality of parallel passages. These inner and outer walls are formed with throughgoing perforations opening into the passages so that as the synthetic-resin material expands it passes through the perforations on the inner walls only and projects into the passages.

Abstract: A process for obtaining isobutylene in a purity greater than 99.5% from an initial feed of relatively pure isobutylene which further has minor quantities of tertiary butyl alcohol, water, polymers of isobutylene, and cis and trans-2-butenes in an economic manner while retaining good yields of the isobutylene by distilling the initial feed to separate a significant portion of the isobutylene with a purity equal to or greater than 99.

Abstract: A body to be packaged is suspended on filaments in an upwardly open porous mold which is lined with a gas-pervious sheet material. The mold is capped and a synthetic resin is introduced therein and expanded, the air in the mold being displaced out through the mold walls, to completely encapsulate the body. The supporting filaments, extending from the package so formed can be drawn across each other to cut an opening in the package permitting the packaged body to be removed. The sheet material covers the outside of the package, being integral therewith, and protects the package while permitting it to be written on.