Abstract: A rotomolding tool having a textured surface is provided. The tool comprises a shell having a body portion and an upper mold surface having a grain texture, at least the body portion comprising a nickel-iron alloy having a coefficient of thermal expansion of at most 5.O×10?6 in/in/° F. at temperatures between 100° and 500° F.

Abstract: A system is provided for drilling a borehole into an earth formation, comprising a casing arranged in the borehole, a drill string extending through the interior of the casing to a lower end portion of the borehole, and a body of drilling fluid extending into the casing, the casing having an inner surface susceptible of wear due to frictional contact with an outer surface of the drill string during drilling of the borehole with the drill string. The system further comprises means for reducing wear of the inner surface of the casing, the means including at least one of a hardened layer at the inner surface of the casing, a friction-reducing layer at the outer surface of the drill string, and a lubricating compound contained in the body of drilling fluid.

Abstract: Apparatus and methods for selectively coating the surfaces of objects are disclosed. The apparatus comprises a plurality of megasonic transducers which generate acoustical pressure waves in the megasonic frequency range in an upward direction and cause droplets of coating material to be expelled from a supply of the liquid coating material which is disposed above the transducers. The droplets travel in a generally upward direction toward the surface of the object to be coated which is held in an inverted, i.e., downward position.