Abstract: A method and apparatus are described for enhanced detection relative to background radiation, of electromagnetic signals from an emitter of radiation in response to incident radiation. The method and apparatus have particular applicability in the field of particle detection, e.g. fluorescent particle detection.

Abstract: A hydraulic power source has a main body with a valve body and a valve assembly disposed in it. A reservoir and pump body assembly is connected to a top surface of the main body, and a hydraulic piston/cylinder assembly is connected to a bottom surface of the main body. A hydraulic circuit connects the various elements for fluid flow. The hydraulic power source is compact and can be located remotely on, for example a vehicle, at a point near an object or part to be moved.

Abstract: The invention provides new hydrogel forming materials comprising synthetic, hydrophilic, aqueous-insoluble polymer networks formed by copolymerization of a hydrophilic dihydroxyalkyl acrylate or methacrylate, a substantially water insoluble alkyl acrylate or methacrylate, one or more additional hydrophilic comonomers selected from the group of vinylic monomers, acrylates, and methacrylates, and a cross-linking agent. The hydrogels are preferably used for the formation of contact lenses, but may also be used for drug and pesticides delivery devices; dialysis, ultrafiltration and reverse osmosis membranes; implants in surgery and dentistry; and the like.

Abstract: .alpha.-Arylalkanoic acids or esters, orthoesters or amides thereof are prepared by forming an .alpha.-hydroxy ketal or thioketal of an aryl alkyl ketone, activating the .alpha.-hydroxy substituent with an esterifying agent to form the corresponding ketal or thioketal ester substrate, wherein the ester group is sufficiently labile to non-catalytically disassociate from the substrate in a protic or dipolar, aprotic solvent, maintaining the ester substrate in contact with the protic or dipolar, aprotic solvent or mixtures thereof for a time sufficient to form the corresponding .alpha.-arylakanoic acid or ester, orthoester or amide thereof, and optionally concomitantly or sequentially hydrolyzing any ester, orthoester or amide formed to the corresponding .alpha.-arylalkanoic acid.

Abstract: A manufacturing method is described for the preparation of optically active 1-aromatic-group-substituted-1-alkanones characterized in that an optically active alkane acid halide is allowed to react with an aromatic compound in the presence of a Lewis acid. The optically active 1-aromatic-group-substituted-1-alkanones are useful intermediates in the preparation of optically active alpha-arylalkanoic acids, which are useful as pharmaceutical, e.g. anti-inflammatory, analgesic and anti-pyretic, agents and as insecticidal agents.

Abstract: A gas-driven dental scaling instrument having a resiliently mounted vibratable tube-and-rotor vibrating mechanism is disclosed, which instrument includes torque reaction means to oppose twisting forces applied to the vibratable tube supported on its resilient mountings during engagement or disengagement of a work tool with or from one end of the vibratable tube.

Abstract: Mixtures of d 2-(6-methoxy-2-naphthyl)propionic acid and 1 2-(6-methoxy-2-naphthyl)propionic acid or soluble salts thereof are resolved with N-R-D-glucamine or salts thereof, where R is alkyl having 2 to 36 carbon atoms or cycloalkyl having 3 to 8 carbon atoms, to yield a product substantially enriched in d 2-(6-methoxy-2-naphthyl)propionic acid.

Abstract: A manufacturing method is described for the preparation of optically active 1-(6-methoxy-2-naphthyl)-2-(alkoxycarbonyl)amino-1-propanone, its derivatives and their halo analogs. The optically active 1-(6-methoxy-2-naphthyl)-2-(alkoxycarbonyl)amino-1-propanone, its derivatives and their halo analogs are useful intermediates in the preparation of 2-(6-methoxy-2-naphthyl)propionic acid, which is useful as pharmaceutical, e.g. antiinflammatory, analgesic and anti-pyretic agents.

Abstract: A transverse motion linkage for a patient support has a four-bar linkage connecting the seat of the support and the base for forward transverse motion upon simultaneous reclining of the backrest and lifting of the leg rest through action of a three-bar, motion-imparting linkage.

Abstract: An injection device particularly suitable for the intraruminal injection of ruminants is described. The injection device is characterized by a needle carrying means and a needle actuation means, which are operatively coupled such that the needle actuation means permits movement of the needle carrying means from a retracted position to an extended position, wherein the needle is capable of piercing the rumen, only when the needle carrying means is in a preferred orientation (e.g. perpendicular) to the surface of the host animal at the injection site. The injection device is further characterized by a dose delivery actuation means which is responsive to the relative position of the needle carrying means and the needle actuation means such that the dose is delivered to the host animal only when the needle carrying means and the needle actuation means are in a preferred position relative to each other.

Abstract: A vibratory endodontic device is described for mechanical preparation of dental radicular canals, i.e., root canals, prior to their obturation. The device includes a housing, a vibratory drive means supported within the housing to minimize the transfer of vibration to the housing, an endodontic file connected to the drive means for vibratory movement and stop means operatively connected to the housing and substantially isolated from the mechanical vibrations created by the vibratory drive means. Additionally, fluid transport means are provided for maintaining a continuous flow of irrigation fluid along the endodontic file. Various assemblies for retaining the endodontic files on the operative end of the vibrating device are also described.

Abstract: An implanting device for implanting pellets and like subcutaneously or intramuscularly in animals is described which utilizes means for indexing an implant magazine having a plurality of pellet-containing stations therein and means for automatically retracting a needle from about an implant charge to deposit the pellets in an animal. The implant magazine is indexed for sequential applications automatically as the retraction mechanism is cocked. Additionally, means for automatically ejecting a spent or empty implant cartridge are provided to prevent false deposition of implants. An implant cartridge having open channels containing implants can be utilized with the implanting device, the channels having means thereon for increasing the size of the channel during the implanting step to substantially eliminate the crushing or breaking of pellets as they are expelled from the cartridge. Alignment and stabilization means for the implant magazine and the implanting device also are provided.

Abstract: A pinch valve assembly is described for location between the manifold assembly and the flow adjustment valves of a dental handpiece system. The pinch valve assembly of the present invention comprises a housing having a plurality of passageways extending therethrough for receiving a plurality of resilient tubes therein. A plurality of transverse slots extending from each of the passageways to the bottom of the housing are provided and are adapted to receive a plurality of slide elements in each of the slots such that the slide elements can move reciprocally within the slots. The housing is supported on a base and a flexible diaphragm is located between the housing and the base. A rigid disc rests on the diaphragm and supports the slide elements in the slots. A chamber is provided in the base beneath the diaphragm and connected to a source of pressurized fluid.

Abstract: An operatory stool having an arcuate, body support arm positioned above the level of the stool seat is described. The body support arm is reversible for right- or left-handed use of the stool. The stool structure permits rapid interchange between the right- and the left-handed configurations by means of a rotatable mechanism between the body support arm and a connecting member between the body support arm and the seat, which permits rotation of the body support arm through a 180.degree. upwardly extending arc from one side of the connecting member to the other. Means are provided for locking the body support arm at dependent positions on either side of the connecting member. Additionally, a reversible locking mechanism for resisting rotation of the body support arm about the connecting member in a predetermined direction in a horizontal plane is provided.

Abstract: An injection device particularly suitable for the intraruminal injection of ruminants is described. The injection device is characterized by a needle carrying means and a needle actuation means, which are operatively coupled such that the needle actuation means permits movement of the needle carrying means from a retracted position to an extended position, wherein the needle is capable of piercing the rumen, only when the needle carrying means is in a preferred orientation (e.g. perpendicular) to the surface of the host animal at the injection site. The injection device is further characterized by a dose delivery actuation means which is responsive to the relative position of the needle carrying means and the needle actuation means such that the dose is delivered to the host animal only when the needle carrying means and the needle actuation means are in a preferred position relative to each other.

Abstract: An implanting device for implanting pellets and like subcutaneously or intramuscularly in animals is described which utilizes means for indexing an implant magazine having a plurality of pellet-containing stations therein and means for automatically retracting a needle from about an implant charge to deposit the pellets in an animal. The implant magazine is indexed for sequential applications automatically as the retraction mechanism is cocked. Additionally, means for automatically ejecting a spent or empty implant cartridge are provided to prevent false deposition of implants. An implant cartridge having open channels containing implants can be utilized with the implanting device, the channels having means thereon for increasing the size of the channel during the implanting step to substantially eliminate the crushing or breaking of pellets as they are expelled from the cartridge. Alignment and stabilization means for the implant magazine and the implanting device also are provided.

Abstract: A fluid actuated brake assembly for use with a parallelogram linkage on a dental tray support arm is described. Floating brake shoes positioned on opposite sides of one member of the parallelogram linkage with one of the brake shoes pivotably and slideably attached to the other member of the parallelogram linkage provides a braking and locking effect between the two members of the parallelogram linkage to provide an efficient brake for a dental tray support arm. Upon fluid actuation of the brake assembly, the brake shoes grip one member of the parallelogram and form a rigid connection with the other member of the parallelogram to prevent relative movement of the parallelogram linkage members. The frictional brake assembly also provides an override feature above a predetermined force level to prevent accidental jamming of the dental tray support arm against an object.

Abstract: A method of conditioning diesel engines is described. In accordance with the method, a diesel engine is operated on a diesel fuel containing from about 20-30 ppm of dicyclopentadienyl iron or an equivalent amount of a derivative thereof for a period of time sufficient to eliminate carbon deposits from the combustion surfaces of the engine and to deposit a layer of iron oxide on the combustion surfaces, which layer is effective to prevent further buildup of carbon deposits, and subsequently the diesel engine is operated on a maintenance concentration of from about 10-15 ppm of dicyclopentadienyl iron or an equivalent amount of a derivative thereof on a continuous basis. The maintenance concentration is effective to maintain the catalytic iron oxide layer on the combustion surfaces but insufficient to decrease timing delay in the engine.

Abstract: A single-unit turbine cartridge assembly for a gas-driven dental handpiece includes a pair of bearing assemblies mounted on a turbine rotor shaft and a ring of resilient material around each bearing assembly. The resilient ring provides radial support for the turbine cartridge assembly within the housing of the handpiece and substantially dampens the transfer of vibration from the cartridge assembly to the handpiece during use of the handpiece. The turbine cartridge assembly may optionally include bearing axial pre-load means in association with one or more of the bearing assemblies. The turbine cartridge assembly also includes means for retaining the resilient radial support means and the bearing axial preload means, when used, in association with the bearing assemblies, so as to permit removal, and reinstallation, of the cartridge assembly as an entire unit from, and to, the housing in the dental handpiece.