Abstract: A cementing tool for use in a well has a housing and a closing sleeve received thereabout. An operating sleeve is received in the housing and is interconnected with the closing sleeve so that movement in the operating sleeve will cause the closing sleeve to move. The closing sleeve is detachably connected to the housing and is movable from the first or open position to a second or closed position in which it covers cementing ports defined in the housing. The tool has a plurality of lock rings that are moved with the closing sleeve. A plurality of locking grooves are adapted to receive the lock rings such that the engagement of any of the lock rings with any of the locking grooves will prevent the closing sleeve from moving out of the closed position.

Abstract: A cementing tool for use in a well has a housing and a closing sleeve received thereabout. An operating sleeve is received in the housing and is interconnected with the closing sleeve so that movement in the operating sleeve will cause the closing sleeve to move. The closing sleeve is detachably connected to the housing and is movable from the first or open position to a second or closed position in which it covers cementing ports defined in the housing. The tool has a plurality of lock rings that are moved with the closing sleeve. A plurality of locking grooves are adapted to receive the lock rings such that the engagement of any of the lock rings with any of the locking grooves will prevent the closing sleeve from moving out of the closed position.

Abstract: Methods and devices for completion of well bores and more particularly, to reverse circulation cementing of casing strings in well bores are provided. One example of a method may comprise a method for providing fluidic access to an outer annulus of a casing string within a well bore. One example of a device may comprise a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger; a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.

Abstract: A method for selectively closing a downhole one way check valve, the method having the following steps: attaching the valve to a casing; locking the valve in an open configuration; running the casing and the valve into the wellbore; reverse circulating a composition down an annulus defined between the casing and the wellbore; injecting a plurality of balls into the annulus; unlocking the valve with the plurality of balls; and closing the valve.

Abstract: A method for selectively closing a downhole one way check valve, the method having the following steps: attaching the valve to a casing; locking the valve in an open configuration; running the casing and the valve into the wellbore; reverse circulating a composition down an annulus defined between the casing and the wellbore; injecting a plurality of balls into the annulus; unlocking the valve with the plurality of balls; and closing the valve.

Abstract: Methods and devices for completion of well bores and more particularly, to reverse circulation cementing of casing strings in well bores are provided. One example of a method may comprise a method for providing fluidic access to an outer annulus of a casing string within a well bore. One example of a device may comprise a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger; a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.

Abstract: A slip element and a method of manufacturing same according to which two or more inserts are placed in corresponding openings formed in a body member. The material forming the insert in one of the openings is stronger than the material forming the insert in another of the openings.

Abstract: A reflector stack or acoustic mirror arrangement for an acoustic device is described which may attain the highest possible impedance mismatch between alternating higher and lower impedance reflecting layers of the stack, so as to maximize bandwidth. The arrangement may also reduce manufacturing costs by requiring fewer layers for the device, as compared to conventional acoustic mirrors. The thinner reflecting stack is accordingly fabricated in reduced time to lower cost, by incorporating materials providing a larger acoustic impedance mismatch than those currently obtainable. The bandwidth of the resulting acoustic resonator device may be widened, particularly when a low density material such as aerogel, CVD SiO2 and/or sputter deposited SiO2 is applied as topmost layer in the reflector stack/acoustic mirror arrangement of the device.

Abstract: Disclosed are a method of making GaAs-based enhancement-type MOS-FETs, and articles (e.g., GaAs-based ICs) that comprise such a MOS-FET. The MOS-FETs are planar devices, without etched recess or epitaxial re-growth, with gate oxide that is primarily Ga2O3, and with low midgap interface state density (e.g., at most 1×1011 cm−2 eV−1 at 20° C.). The method involves ion implantation, implant activation in an As-containing atmosphere, surface reconstruction, and in situ deposition of the gate oxide. In preferred embodiments, no processing step subsequent to gate oxide formation is carried out above 300° C. in air, or above about 700° C. in UHV. The method makes possible fabrication of planar enhancement-type MOS-FETs having excellent characteristics, and also makes possible fabrication of complementary MOS-FETs, as well as ICs comprising MOS-FETs and MES-FETs.

Abstract: An emulsification device having a mobile frame, mobile fluid deflectors, and stationary fluid deflectors, with the fluid shear deflectors being positioned in the outer periphery of the interior of the device, and with minimal flow resistance from factors other than the deflectors. Flow of component fluids passes directly through the fluid shear areas, with a minimal flow path through other flow resisting structures.

Abstract: Disclosed are articles that comprise an oxide layer on a GaAs-based semiconductor body, with metal layers on the oxide and the body facilitating application of an electric field across the oxide layer. The interface between the oxide and the semiconductor body is of device quality. Contrary to teachings of the prior art, the oxide is not essentially pure Ga.sub.2 O.sub.3, but instead has composition Ga.sub.x A.sub.y O.sub.z, where A is an electropositive stabilizer element adapted for stabilizing Ga in the 3+ oxidation state. Furthermore, x.gtoreq.0, z is selected to satisfy the requirement that both Ga and A is substantially fully oxidized and y/(x+y) is greater than 0.1. Stabilizer element A typically is selected from Sc, Y, the rare earth elements and the alkaline earth elements. Articles according to the invention exemplarily comprise a planar enchancement mode MOS-FET with inversion channel. A method of making articles as described above is also disclosed.

Abstract: Carbonaceous materials based on the fullerene molecules have been developed which allow for superconductivity. The fullerene materials are soluble in common solvents.

Abstract: Nonaqueous, rechargeable batteries are described which employ a conventional negative electrode and a positive electrode with a new and unique active material. Such batteries are advantageous because of the high capacity per unit weight and per unit volume exhibited by the positive electrode and the extensive rechargeability of these batteries.