Abstract: The present invention relates to 1,2,4-oxadiazole derivative of the formula (I) ##STR1## wherein X represents a chlorine or fluorine atom or methyl group,Y represents a chlorine or fluorine atom,n is an integer of 1 or 3.The compounds of the invention have a extremely high selectively between paddy rice or crop plants and weeds, and a strong activity on various weeds. Moreover, the compounds have a very low phytotoxicity to paddy rice and crop plants.

Abstract: An aquatic control sleeve apparatus for enabling application of chemical agents to underwater aquatic vegetation accumulating in a body of flowing water and a method for enabling application of the same. The aquatic control sleeve apparatus has an aquatic control sleeve placeable within a body of flowing water substantially parallel to its normal flow path. A first collar attached to the upstream end of the aquatic control sleeve funnels the entire flow of water into the aquatic control sleeve. The water surrounding the aquatic control sleeve is stilled or pacified by the funnelling of the moving water into the aquatic control sleeve, thus permitting the application of chemical agents to the stilled water to treat underwater vegetation without the fear of the chemical agents being swept away by the water current. A second collar is provided at the downstream end of the aquatic control sleeve and discharges the water funnelled through the aquatic control sleeve.

Abstract: A support for use with a keyboard for supporting the wrists of an operator. The support includes a base having a front, sides, and a back. The base is contoured to receive and support a keyboard. A pad member is secured to an upper surface of the base along the entire front. The pad member provides cushioning support for the wrists of the operator. An enclosure is also provided and includes a mounting platform which is slidably mounted along a lower surface thereof. The keyboard and support are placeable upon the mounting platform so as to be withdrawn from the enclosure. A computer terminal may be appropriately placed atop the enclosure so as to be optimally positioned with respect to the keyboard operator.

Abstract: Arm exercise apparatus in the form of dumbbells having a hand hold portion and ball weight members at opposite ends of the hand hold portion to form a housing containing self defense means. In one embodiment the self defense means is an extensible portion forming a club, in another embodiment the mechanism forms an audible alarm and in still another embodiment the housing holds a canister of debilitating gas which can be released on demand.

Abstract: An apparatus for molding a cap (16) including a base portion (18) and peripheral skirt (20) extending axially from and about the base portion (18) includes an outer surface forming mold (44) for forming an outer surface of the base portion (18) and the peripheral skirt (20) and an inner surface forming mold (46) seatable within the outer surface forming mold (44) for forming an inner surface of the base portion (18) and the peripheral skirt (20). The outer surface forming mold (44) is retractable from seated engagement with inner surface forming mold (46) for exposing the moded cap (16) therebetween. The inner surface forming mold (46) includes a core portion (52) and lug forming mold portions (54) disposed radially peripherally thereabout, the lug forming mold portions (54) being able to project axially from and retract radially inwardly relative to the central core portions (52) for releasing and ejecting the molded cap (16)from the inner surface forming mold ( 46).

Abstract: A cleaning system for exhaust ducts of cooking hoods. A hot water cleaning liquid is introduced at high pressure to a spray manifold in an exhaust duct. The manifold conforms to the internal perimeter of the exhaust duct and has nozzles for directing the cleaning fluid. The manifold is moved along the length of the duct to cover the internal surface area of the duct.

Abstract: An animal feeder is disclosed for use with a ground surface. The animal feeder includes a container which defines a chamber adapted to contain granular animal feed. A plurality of legs support the container in an elevated position above the ground surface. An elongated tube open at each end is secured to the container so that the open upper end of the tube is open to the chamber and thus to the animal feed contained therein. The tube extends generally vertically downwardly so that the bottom of the tube is open to the ground surface. Moreover, the tube is dimensioned so that its lower end is spaced upwardly from the ground surface by a distance such that animal feed from the chamber flows downwardly from the chamber in a controlled fashion and forms a pile on the ground beneath the tube and around the lower end of the tube. Thus, the pile blocks the further flow of animal feed through the tube until a portion of the animal feed on the ground surface is eaten or otherwise removed.

Abstract: A sensor is disclosed for detecting the relative air/fuel ratio of the exhaust gas from an internal combustion engine. The sensor includes a housing which defines a closed interior chamber. An oxygen diffusion cell constructed of a solid electrolytic material has one side exposed to the exhaust gas and a second side exposed to the housing chamber so that oxygen ions flow through the diffusion cell in dependence upon the relative oxygen concentration in both the exhaust gas and the internal air chamber. A sense cell constructed of a solid electrolytic material also has one side exposed to the air chamber and a second side exposed to a substantially constant source of oxygen, such as the atmosphere. Thus, oxygen ion flow through the sense cell varies as a function of the oxygen concentration in the air chamber and thus of the oxygen concentration in the engine exhaust gas.

Abstract: A dental laser assembly is disclosed for use in eradicating carious lesions in teeth, the treatment of sensitive teeth, as well as the removal of soft tissue, the incising of the frenum, opurculum, anesthesia of the tooth, etching enamel for restorations or orthodontic appliance fixation, the welding of fixed prosthesis, removal of bacterial flora periodontal pockets, removal and/or vaporization of healthy or necrotic pulp, the vertical and/or horizontal condensation of gutta percha or any other root canal sealant, the cauterization of blood vessels in the oral cavity, vaporizing bone tissue, removing tartar, apical fusion of foramina, enlarging and shaping root canal, removing carbon from surface of teeth, removal of enamel, bleaching teeth, etching dentin, separating orthodontic brackets, merging hydroxyapatite to bone and enamel, amalgam removal and undercutting of carious and/or healthy dentin and/or cementum. The laser assembly includes a housing having a cavity in which a pulsed laser is contained.

Abstract: An absolute position transducer (encoder) comprising an incremental encoder having a coded disk connected stably to a shaft, and connected to a sensor for emitting a signal for each complete turn of the disk The incremental encoder produces a first and second signal, each consisting of a sequence of pulses in which each pulse equals one elementary angular increment of the shaft, and a third signal (ZERO) consisting of a sequence of zero pulses, each emitted for each complete turn of the shaft.

Abstract: Apparatus and a method are provided whereby snow is made in an indoor environment over extended periods. Within the indoor environment temperature and humidity conditions are set up to enable snow to be produced by a spray of water in the air. Such conditions are maintained for an extended time by the use of thermal storage means. The thermal storage means is cooled to a low temperature by coolant in turn cooled by refrigeration apparatus. The thermal storage means uses a mass of relatively high conductivity material through which the coolant is circulated and the coolant is used to cool and dry air to be discharged into the indoor environment.

Abstract: A handpiece assembly is disclosed for use with a dental laser assembly of the type having a laser and an elongated optical fiber assembly. The optical fiber assembly has a proximal end which receives radiation from the laser and a distal end which delivers the laser radiation to a target site. The handpiece assembly includes an elongated handpiece which is dimensioned to be held in a human hand. A longitudinal throughbore is formed in the handpiece and is dimensioned to slidably receive the optical fiber assembly so that the distal end of the optical fiber assembly extends outwardly from one end of the handpiece. A locking assembly removably locks the other end of the handpiece against longitudinal movement to the optical fiber assembly. Furthermore, the entire handpiece assembly is discarded after use on a single patient to prevent disease transmission by the handpiece.

Abstract: The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates a control valve for selectively controlling the flow of hydraulic fluid to input ports of a power output transducer. The power output transducer is then utilized to position a mechanical device. The control system is a closed loop circuit adapted to supply hydraulic fluid at a desired supply pressure to the control valve. The supply pressure is varied in relation to the absolute value of the pressure differential or load pressure exerted across the input ports of the power output transducer. A pressure regulating apparatus is provided for selectively regulating the supply pressure to a value that is nominally equal to the absolute value of the load pressure summed with a preselected supplemental pressure value across the regulating apparatus.

Abstract: A rear view mirror unit for a commercial vehicle, comprising a mirror, a support element to which this mirror is fixed, pivot means for connecting the support element in such a manner as to project from at least one region of the vehicle body defining at least one preferential angular position of the support element itself with respect to the body, and a cable slidably engaging a bushing fixed to the support element and connected to a coil spring with its front end, the free ends of the cable and the spring are connected to respective brackets fixed to the body to the sides of the said pivot means.

Abstract: A stadium chair assembly for use in combination with existing rows of colinear bleacher seats comprising a forward row and a rearward row of backless bleachers. Two embodiments are preferred, the first being a one-piece seat having a ribbed base for gripping a forward bleacher and a back that is rested upon the front portion of the rearward bleacher. The second embodiment is a two-piece seat assembly the seat back of which is pivotably attached to a seat support structure that extends from the seat back to the bleacher floor behind the forward bleacher and in front of the rearward bleacher. The support structure may be hollow and insulated to provide storage space for cold beverages or hot food.

Abstract: This invention relates to the field of chemistry and more precisely to the field of medicinal Chemistry.It has specifically as subject matter the compounds of general formula I ##STR1## wherein R is a hydrogen, a lower alkyl radical a methoxymethyl, a tetrahydropyranyl or the acyl residue of an organic carboxylic.

Abstract: A system for inspecting the ends of cigarettes prior to their packaging on a conveyor line. The system provides telecamera units which produce images of the ends of a group of cigarettes. A processing unit then analyses the brightness level of a given area on each cigarette end. The processing unit then counts the total number of areas having a brightness level within a given range and compares that number with that of a reference end image for determining the existence of defects. An expulsion unit is further provided for rejecting those groups of cigarettes which fall below the requirements of the reference end image.