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John E Tschirky: Segmented stator for progressive cavity transducer. Smith International Corporation, Philip Subkow, September 28, 1976: US03982858 (18 worldwide citation)

This invention relates to progressing cavity fluid motors with multiple segmented stator elements connected in series to provide a fluid passageway from the input of the initial stator of the series to the output of the terminal stator of the series; the rotor elements in each stator are connected t ...


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John E Tschirky, Bela A Geczy: Spring-loaded bearings for in-hole motors. Smith International Corporation, Philip Subkow, September 28, 1976: US03982797 (12 worldwide citation)

This invention relates to spring-loaded thrust bearings for shafts subject to a plurality of levels of thrust loads and in its preferred embodiment is applied to in-hole motors. The invention employs a plurality of spring systems, whereby the thrust load on one set of springs is limited to one level ...


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Luca Tedeschi, James L Larsen, Gary Portwood: Rock bit with vectored hydraulic nozzle retention sleeves. Smith International Corporation, Conley Rose PC, David A Rose, June 25, 2009: US20090159340-A1

A drill bit for drilling through an earthen formation to form a borehole. In an embodiment, the drill bit comprises a bit body having a central axis, an internal plenum, and an underside. The underside includes an annular outer region. The bit body includes an outer receptacle extending from the ple ...