Abstract: A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the presence of hydrogen in a selective hydrogenation zone maintained under selective hydrogenation conditions effective for selective hydrogenation of impurities containing reactive carbonyl groups thereby to hydrogenate the impurities to the corresponding alcohols. After recovery from the selective hydrogenation zone of a selectively hydrogenated reaction product mixture including the alkyl alkanoate and the corresponding alcohols, this is distilled in one or more distillation zones so as to produce substantially pure alkyl alkanoate therefrom which is recovered.

Abstract: Novel processes and intermediates are provided for the synthesis of derivatives of 4-amino-3-hydroxypyrrole-2-carboxylic acids that are useful as monomers for polyamides capable of binding dsDNA. According to one preferred reaction scheme, an alkyl alkoxymethylene nitroacetate (Formula VIII) is prepared by reaction of a trialkyl orthoformate or orthoacetate with a nitroacetate ester in the presence of a carboxylic anhydride. The compound of Formula VIII is condensed with an N-substituted glycine to yield an N-substituted (2-nitro-2-alkoxycarbonyl)vinyl glycinate ester (Formula VII). Ring closure in the presence of an alkali metal alkoxide yields a 4-nitro-3-hydroxypyrrole-2-carboxylic ester (Formula V). After blocking of the 3-hydroxy group to produce a further intermediate (Formula IV), the 4-nitro group is reduced to a 4-amino group (Formula III), and the 4-amino group is then blocked by reaction with a dicarbonate diester to produce the fully blocked intermediate (Formula II).

Abstract: A sample injector valve capable of introducing multiple samples of material into multiple liquid or gas streams is provided. Such a valve is particularly useful for injecting multiple samples under pressure into a combinatorial chemistry system with moving streams of fluid, such as a parallel pressure reactor or a rapid flow analysis system using multi-channel or parallel chromatography and related techniques. The valve is further capable of functioning on a small scale with automatic sampling equipment.

Abstract: The present invention is directed to filled prepregs, laminates, printed circuit boards comprising a reinforcing material impregnated with a cured polymeric resin, the cured polymeric resin comprising multicellular polymeric microspheres as a filler. Pre-pregs, laminates and printed circuit boards prepared by this method have reduced dielectric constant as low as 3.0, depending upon the resin system of the matrix. In addition, such laminates and printed circuit boards have enhanced electrical, thermal and mechanical properties as well as improved machinability, low density and a uniform appearance.

Abstract: A surveying equipment support leg used with a support for supporting surveying equipment and the like is capable of mounting alternate ground engaging structures without removal of an existing foot on the leg. Attachment of the alternate structure is made rigidly at two points of connection on the foot. Other accessories such as weights to hold down the support can be attached. In particular, a spike may be attached to deeply penetrate the ground for use in certain soil conditions. The foot is molded and accurately adhered to the leg. As used together with other legs in a support, the foot is capable of attaching the legs together in a collapsed position for storage and transport of the support. The leg is connected to a head of the support in a sealed hinge which prevents damage to the hinge resulting in loss of rigid stability to the support.

Abstract: The present invention relates to an epitaxial wafer comprising single crystal silicon substrate and an epitaxial layer deposited thereon. The substrate comprises an axially symmetric region which is free of agglomerated intrinsic point defects and wherein silicon self-interstitials are the predominant intrinsic point defect in the axially symmetric region. The present invention further relates to a process for producing such an epitaxial wafer.

Abstract: A software program for analyzing an embroidery design of stitches which design will be used by an embroidery machine to create an embroidered fabric. Grid software divides the embroidery design to be analyzed into a plurality of grid sections. Identifying software identifies each grid section having a stitch which is partially or completely underlying another stitch. Modification software removes underlying stitches or a portion thereof in each identified grid section. The size of each grid section may be increased or decreased in proportion to a stretch of the thread to be used to create the embroidered fabric.

Abstract: An apparatus and method for image registration of a template image with a target image with large deformation. The apparatus and method involve computing a large deformation transform based on landmark manifolds, image data or both. The apparatus and method are capable of registering images with a small number of landmark points. Registering the images is accomplished by applying the large deformation transform.

Abstract: A lubrication system for a vibratory apparatus such as a hydraulic striking device. The system includes a lubricant pump for pumping lubricant to one or more points of lubrication on the device and a drive for the pump powered in response to vibration of the device. The system includes a base for attachment to the device for vibration therewith, and a lubricant pump for pumping lubricant from a supply. The pump includes a cylinder and a plunger reciprocable in the cylinder through a stroke between a retracted position for intake of lubricant into the cylinder and a forward position for delivery of the intake from the cylinder. A weight is mounted on the base for oscillation in response to the vibration of the device, oscillation of the weight effecting reciprocation of the plunger through a stroke.

Abstract: A process for the preparation of a composition having the formula: in which a compound having the formula: is treated with a base and a silylating agent.

Abstract: The present invention is an apparatus and method for performing a Gaussian Minimum Shift Keying baseband modulation based on a reference phase to be simplified. The invention mainly comprises: a memory unit storing a plurality of parameters and their corresponding tabular data of a low pass Gaussian filter, the parameters and their corresponding tabular data being simplified in advance; the low pass filter being used for reducing the bandwidth of the apparatus and increasing the utilization of the bandwidth; and a processing unit based on the input digital data and the tabular data in the memory unit to generate the digital in-phase signal In and the digital quadrature-phase signal Qn.

Abstract: Novel 9&agr;-hydroxy steroid compounds, including compounds of Formula IX wherein —A—A—, —B—B—, R1, R3, R8 and R9 are as defined in the specification.

Abstract: The present invention is an apparatus and method for performing a &pgr;/4-DQPSK baseband modulation based on a signal mapping to be simplified. The apparatus mainly comprises a memory unit and as processing unit. The memory unit stores a plurality of parameters and their corresponding tabular data of a low pass filter, and the parameters and their corresponding tabular data are simplified in advance. The low pass filter is used for reducing the bandwidth of the apparatus and increasing the utilization of the bandwidth. The processing, unit bases on the input digital data and the tabular data in the memory unit to generate a digital in-phase signal In and a digital quadrature-phase signal Qn.

Abstract: A single use camera which has a motor to advance film comprising a light-tight casing having an exposure aperture through which exposures are made, an unexposed film wound up around a pre-winding take-up spool disposed on one side of the exposure aperture, a removable film cartridge having a film take-up spool therein disposed on the opposite side of the exposure aperture from the pre-winding take-up spool, a motor to pre-wind the unexposed film around the pre-winding take-up spool beforehand and to wind exposed frames of the film back to the removable film cartridge. The motorized single use camera uses the built-in motor for all the film windings so that any special film loading device to roll up the unexposed film beforehand outside of the camera in a dark room is not required, and the same motor can be used for film winding after each exposure so that any manual film winding mechanism is not required.

Abstract: A toilet seat lift comprising a base having opposite sides, a seat support mounted on the base for pivotal movement about a generally horizontal axis extending side-to-side with respect to the base between a lowered position and a raised position, a seat on the seat support having an opening therein adapted to overlie a toilet, and a power actuator for pivoting the seat support from its lowered position to its raised position.

Abstract: A metal chelating composition having the formula: wherein Q is a carrier; S1 is a spacer; L is —A—T—CH(X)— or —C(═O)—; A is an ether, thioether, selenoether, or amide linkage; T is a bond or substituted or unsubstituted alkyl or alkenyl; X is —(CH2)kCH3, —(CH2)kCOOH, —(CH2)kSO3H, —(CH2)kPO3H2, —(CH2)kN(J)2, or —(CH2)kP (J)2, preferably —(CH2)kCOOH or —(CH2)kSO3H; k is an integer from 0 to 2; J is hydrocarbyl or substituted hydrocarbyl; Y is —COOH, —H, —SO3H, —PO3H2, —N(J)2, or —P(J)2, preferably, —COOH; Z is —COOH, —H, —SO3H, —PO3H2, —N(J)2, or —P(J)2, preferably, —COOH; and i is an integer from 0 to 4, preferably 1 or 2.

Abstract: A sensorless switched reluctance motor and its method of manufacture. A stator core having slots for receiving windings and having an opening for receiving a rotor for rotational about a rotational axis is provided. A separator is positioned adjacent to the stator to define to two separate sections in each of the slots, the sections having a contiguous side defined by a radial line passing through the rotational axis. Wire is guided by the separator into the slots to form the windings in the slots such that each slot has two different windings therein, one winding in each of the separate sections of each slot, and such that one of the windings in a particular slot is separated substantially along the radial line from the other winding in the particular slot. A rotor is inserted in the opening of the stator and the assembly of the motor is completed.

Abstract: 1-Deoxybaccatin III, 1-deoxytaxol and 1-deoxy taxol analogs and method for the preparation thereof.

Abstract: A MIG welding torch reconditioning apparatus has a pneumatic supply line, vent means and a mechanical transmission shaft. The pneumatic supply line supplies air to the vent means for venting a directed debris-scattering air-flow against the transmission shaft proximal to exposed seals thereon. In another aspect, the apparatus has an in-line, direct-drive arrangement of a motor, a mechanical transmission shaft, and chuck means for receiving a reaming tool. Pneumatic lift means lifts the direct-drive arrangement into reaming tool engagement with the gas shield of a torch wherein the tool is operable to remove at least some of any back-splash deposits laid down on interior surfaces of the gas shield. A clamp is also provided for engaging a cylindrical body, such as a torch. The clamp includes a pair of generally orthogonally-offset faces of a “V”-block and respective gripping surfaces on gripping surface members of a pair of opposed jaws.

Abstract: A process and device for determining absolute position by means of two coupled individual sensors which in the measuring range generate saw tooth-shaped output signals with a number of periods (k1 and k2) varying by “1,” and use of a third sensor, which in the measuring range also generates a saw tooth-shaped output signal with a third number of periods (k3) in which k3 differs from k1 and k2 by the absolute value ½. If the first or second sensor fails, a differential signal is generated between the output signal of the remaining functional sensor and the third sensor.