Abstract: A football helmet includes a one-piece outer shell defining an exterior and an interior. The one-piece outer shell includes a crown portion, defining an upper region of the shell. The shell further includes a front portion, extending generally forward and downward from crown portion, a left side portion, and a right side portion. The left side portion and the right side portion extend generally downward and laterally from the crown portion sufficiently to cover a respective left or right ear of a football player wearing the helmet. The outer shell further includes a rear portion, extending generally rearward and downward from the crown portion. The helmet includes a plurality of bumps defined on the exterior of the outer shell. Each of the bumps are a dome shaped protrusion that absorb, deflect, and distribute energy upon impact.

Abstract: A system for impregnating a superconductive wire surrounded by insulation with a resin provided in liquid form in a vessel, has an input arrangement that introduces the wire into the vessel, a transport device that moves the wire through the resin in the vessel and a pressure applicator that applies pressure to the wire, transversely to its length, at at least one location within the vessel while in contact with the resin, so as to expel gases otherwise trapped within the insulated wire. Each pressure applicator is formed by a co-operative pair of pinch rollers, with one pinch roller of each pair being doubly flanged to provide a substantially central recess to accommodate the insulated wire, and the other pinch roller of each pair is formed with a central tongue dimensioned to enter the recess to trap the wire therein and apply pressure thereto.

Abstract: A method for producing a high solids aqueous slurry of particulate calcium carbonate having highly stable aging characteristics, comprising dispersing in water at at least 70% by weight solids, a finely divided particulate calcium carbonate, utilizing as a dispersing agent from 20 to 34 lbs/ton of dry mineral (expressed as 40% actives), of a copolymer of acrylic acid and a sulfonated vinyl monomer, which is converted to the salt form by from about 30 to 50% of its carboxylic acid sites being neutralized with a polyvalent cation, and substantially the balance of said carboxylic sites being neutralized with a monovalent cation.