Abstract: A Moineau style stator includes a stator tube having a plurality of rigid helical lobes formed on an inner surface thereof. The helical lobes define a major internal tube diameter that is greater than a pass through diameter of the tube such that the major diameter undercuts the pass through diameter of the tube. A major liner diameter may also be less than the pass through diameter so as to provide a suitable interference fit between rotor and stator.

Abstract: A Moineau style stator includes a stator tube having a plurality of rigid helical lobes formed on an inner surface thereof. The helical lobes define a major internal tube diameter that is greater than a pass through diameter of the tube such that the major diameter undercuts the pass through diameter of the tube. A major liner diameter may also be less than the pass through diameter so as to provide a suitable interference fit between rotor and stator.

Abstract: A progressive cavity pump or motor, particularly suitable for hydrocarbon recovery operations, includes a rotor 20 and a stator 10. Fluid pressure in cavities between the stator and the rotor create torque which rotates the bit. An interior surface of the stator is rigidly secured to the outer housing of the pump stator and defines an interior profile. A substantially uniform thickness elastomeric layer 62 is supported on the outer housing. The pump rotor has an exterior profile which corresponds with the interior profile of the elastomeric layer.

Abstract: A progressive cavity pump or motor, particularly suitable for hydrocarbon recovery operations, includes a rotor 20 and a stator 10. Fluid pressure in cavities between the stator and the rotor create torque which rotates the bit. An interior surface of the stator is rigidly secured to the outer housing of the pump stator and defines an interior profile. A substantially uniform thickness elastomeric layer 62 is supported on the outer housing. The pump rotor has an exterior profile which corresponds with the interior profile of the elastomeric layer.

Abstract: A downhole pump system allows fluid to be pumped from a well to the surface through a production tubing string, while also allowing the downhole pump 10 to be retrieved to the surface while the production tubing string remains in the well. The downhole pump may include a hold down housing 12, a mandrel 14, a drive coupling 18, and a lifting nut 20. The pump is driven by a drive rod, which conventionally extends from the surface to the downhole pump. Axial movement of pump components may be prevented by a spring lock mechanism 24, while torque transmitting surfaces 26 prevent rotation of the pump housing 12 with respect to a landing nipple 25.

Abstract: Whole cells of methylotrophic yeasts are able to oxidize benzyl alcohol to benzaldehyde in aqueous reaction media. However, the low water solubility of the reactant and product of this bioconversion, combined with the ability of both to strongly inhibit the reaction, suggested to us the use of non-aqueous reaction fluids. Using non-aqueous systems, it was found that Pichia pastoris can be used to oxidize higher alcohols. The alcohol oxidase from such yeast had been previously reported unable to oxidize such alcohols. Purified alcohol oxidase was shown to function in a number of two-phase systems of varied aqueous to organic phase concentrations. The stability and biocatalyst recovery of the enzyme was improved by immobilization.

Abstract: A bicycle handlebar has numerous lamps disposed along its length. The handlebar may be transparent or partially transparent with the lamps embedded in the handlebar material. The lamps may be of different colors, and may be of the sort which flash individually. The effect is attractive and appealing to youngsters to encourage the use of the lighting system. The lamps may also be made replaceable; lamp sockets may be embedded in the handlebar material. The lamps are wired in parallel for reliability. The electric power for the lamps is supplied through jacks inserted into the handlebar near the point where the handlebar attaches to the stem of the bicycle.

Abstract: Methylotrophic yeasts of the genera Pichia, Torulopsis, Candida and Hansenula when grown on methanol, make use of an enzyme, alcohol oxidase, to catalyse the initial oxidation of methanol to formaldehyde. Non-growing whole cells of such methylotrophic yeasts were used in place of purified alcohol oxidase for the production of flavoring aldehydes from their respective alcohols. To reduce end product inhibition a number of amine buffers, which chelate the aldehydes, were studied and an increase in aldehyde production was demonstrated with selected buffers which maintain a weakly alkaline pH.