Abstract: An electrical propulsion system for a vertical take-off and landing (VTOL) aircraft comprises an electrical motor assembly and an inverter assembly. The inverter assembly comprises a housing, a capacitor assembly, at least one printed circuit board assembly (PCBA), and a plurality of positioning pins. The capacitor assembly comprises a center hole, at least one capacitor, a capacitor housing having at least one busbar, and a plurality of through holes in the capacitor housing. The capacitor assembly and the at least one PCBA are positioned inside the housing. The plurality of positioning pins pass through the through the plurality of through holes of the capacitor housing and the at least one PCBA and are connected to the housing.

Abstract: Lateral displacement shock absorbing arrays include features allowing them to be effectively installed in environments including helmets having arcuate surfaces. Slotted webbing between adjacent tubes permits their respective axes to tilt with respect to one another to accommodate helmet shape. In this way, the slotted webbing permits each tube to assume an orientation with its axis perpendicular to a tangent to the outer surface of the helmet at that location so that the tube is best aligned with likely impacts. Plural arrays may be assembled together in numerous ways including using a piece of material to which they may be affixed through any one of numerous ways including tabs and slots, posts and holes, stapling, adhesives, laminating, and integrally molding the arrays and material as a one piece assembly. A variety of peripheral shapes for the tubes of the arrays are also contemplated as are numerous materials of construction.

Abstract: The present invention concerns a process for making a polyareneazole polymer comprising the steps of: a) contacting azole-forming monomers, metal powder, and optionally P2O5, in polyphosphoric acid to form a mixture; b) blending the mixture at a temperature of from about 50° C. to about 110° C.; c) further blending the mixture at a temperature of up to about 145° C. to form a solution comprising an oligomer; d) optionally, degassing the solution; and e) reacting the oligomer solution at a temperature of about 160° C. to about 250° C. for a time sufficient to form a polymer.

Abstract: The present invention relates to processes for hydrolyzing polyphosphoric acid in spun multifilament yarns.

Abstract: The present invention concerns a process for making a polyareneazole multifilament yarn comprising: a) extruding a solution comprising polyareneazole polymer and polyphosphoric acid through a plurality of orifices to produce filaments; b) forming a multifilament yarn from said filaments; c) hydrolyzing at least some of the polyphosphoric acid in the yarn by heating the yarn to a temperature above about 120° C. for up to about two minutes; d) washing at least some of the hydrolyzed polyphosphoric acid from the yarn; e) drying the washed yarn; f) optionally, heating the yarn above about 300° C., and g) collecting the yarn at a speed of at least about 50 meters per minute.

Abstract: A protective eye mask for sports use, without a helmet, includes one or more substantially horizontal frame members forming an eye mask frame, defining a cage to protect an area around a user's eyes, the eye mask frame having at least an upper frame segment and a lower frame segment, the frame members having an inside facing towards the user's eyes and an outside facing away therefrom; one or more substantially horizontal frame members arranged between the upper and lower frame segments; one or more substantially vertical frame members continuous with or rigidly attached to one or more of the substantially horizontal frame members; a contact material for contacting the user's face area, attached to the eyewear frame; and a mechanism for securing the protective eye mask to the user's face.

Abstract: A protective eye mask for sports use, without a helmet, includes one or more substantially horizontal frame members forming an eye mask frame, defining a cage to protect an area around a user's eyes, the eye mask frame having at least an upper frame segment and a lower frame segment, the frame members having an inside facing towards the user's eyes and an outside facing away therefrom; one or more substantially horizontal frame members arranged between the upper and lower frame segments; one or more substantially vertical frame members continuous with or rigidly attached to one or more of the substantially horizontal frame members; a contact material for contacting the user's face area, attached to the eyewear frame; and a mechanism for securing the protective eye mask to the user's face.

Abstract: A process is disclosed for making para-aramid filaments of especially high strength by extruding a solution of para-aramid through fine capillaries and drying the resulting filaments under high tension.

Abstract: A device for dispensing a chemical solution into a pipeline transporting a liquid under pressure irrespective of whether the liquid pressure varies between a maximum and a minimum or is subsantially constant. The volume of solution dispensed is varied at times when the liquid pressure is varying by selection of an aperture from a plurality of apertures at varying axial positions, for placing the interior of the pipeline in communication with the interior of the enclosure above the solution level, at times when the level drops axially to the selected apertures; or, at times when the liquid pressure is substantially constant, by adjustment of the amount of liquid permitted to enter the device.

Abstract: A device for dispensing a chemical solution into a pipeline transporting a liquid under pressure irrespective of whether the liquid pressure varies between a maximum and a minimum or is substantially constant. The volume of solution dispensed is varied at times when the liquid pressure is varying by selection of an aperture from a plurality of apertures at varying axial positions, for placing the interior of the pipeline in communication with the interior of the enclosure above the solution level, at times when the level drops axially to the selected aperture; or, at time when the liquid pressure is substantially constant, by adjustment of the amount of liquid permitted to enter the device.

Abstract: A device for controlled feeding of a water-soluble chemical into a water line having a pressure varying between a minimum and a maximum in the line. Water flows from the water line into an air impervious chemical mixing tank through a first one-way check valve. When the pressure in the line is less than the air pressure in the tank, an air reservoir in the mixing tank forces the mixture of water and chemical back into the water line through a control valve which is set at a restricted flow value with respect to the first check valve. A second one-way check valve located in the water line between the one-way check valve and the control valve prevents the contents of the mixing tank fed through the control valve from backing up toward the first one-way check valve.

Abstract: A device for controlled feeding of a water-soluble chemical into a water line having a pressure varying between a minimum and a maximum in the line. Water flows from the water line into an air impervious chemical mixing tank through a first one-way check valve. When the pressure in the line is less than the air pressure in the tank, an air reservoir in the mixing tank forces the mixture of water and chemical back into the water line through a control valve which is set at a restricted flow value with respect to the first check valve. A second one-way check valve located in the water line between the one-way check valve and the control valve prevents the contents of the mixing tank fed through the control valve from backing up toward the first one-way check valve.