Abstract: A rotary driven reciprocating mechanism and method permit a rotary motion to be converted into a reciprocating motion that may be used to control the operation of various devices. For example, in a preferred embodiment, the rotary driven reciprocating mechanism may be used for electronic valve timing control in an internal combustion engine. The rotary driven reciprocating mechanism may also be used as a pump valve timing mechanism or for any other purpose in which it is desirable to convert rotary motion into reciprocating motion.

Abstract: The present invention relates to composite material structures having reduced signal attenuation properties. In particular, the invention relates to composite drillstring components with electromagnetic properties and acoustic properties that enable the use of electromagnetic, acoustic and nuclear sensing equipment to obtain data from a wellbore from within a drill pipe. In a specific embodiment, a composite tube is incorporated with end-fittings which enable its incorporation into a drillstring thereby permitting the use of logging equipment from within the composite tube.