A method and system of selectively identifying at risk die based on location within the reticle. Reticle and stepping information is stored in a database. All reticle shots in a wafer and in a lot are overlaid on top of each other. The reticle and stepping information is used to calculate pass/fail or specific bin yield of reticle fields. It is determined if the yield of some reticle locations is below a statistical measure by a pre-determined threshold, and if so, all the die in that location a...

An automatic loading and unloading system is provided for loading articles supplied from a first location at a rate commensurate with the rate at which articles are supplied from the first location into trays and for unloading the articles from the trays for transport to a second location at a rate commensurate with the demand for articles at the second location, and for balancing a supply of articles loaded onto trays with variations in both the rate of supply thereof and the rate of demand the...

A drive frame (1) for a scraper chain conveyor comprises a pair of spaced-apart parallel sidewalls (2), interconnected by a cross-member (3) welded to both sidewalls (2); a sprocket barrel assembly (18) provided with at least one sprocket ring (19) adapted to engage at least one endless chain assembly of the conveyor; mutually engageable seating surfaces (23, 5) provided respectively on the sprocket barrel assembly (18) and on the cross-member (3); at least one abutment face (7) provided on the ...

A signal amplitude comparator which includes a first input that receives an input signal and generates an output signal that is a non-linear function of the input signal, and a second input circuit that receives a reference input signal and generates a second output signal that generally tracks process, temperature and supply variation. The signal amplitude comparator also includes an amplifier, a filter and a comparator. The amplifier amplifies a signal difference between the first and second o...

An adjustment gear mechanism utilizing a plastic adjustment gear and integrally formed structures which securely retain a drive member. The plastic gear is formed to provide both a gear tooth arrangement which cooperatively meshes with a drive gear and an integrally formed adjustment member bore which provides prevailing torque for an adjustment member. The gear tooth arrangement on the plastic gear is formed to cooperatively mesh with a metal drive gear and withstand the tooth load and deflecti...

An apparatus for mounting a wheel on a vehicle such as a trailer includes a hollow, non-rotatable axle, a wheel hub having a cavity therein and a valve or venting structure positioned between the axle and the wheel hub cavity. The wheel hub has an end connected to the hollow axle and its other end is sealed by an end cap. The cavity within the wheel hub has a volume of air which is substantially less than the volume of air within the axle. The valve is formed by a flexible membrane or diaphragm ...

A plastic carrier for carrying containers includes container engaging portions which extend from a joint. The joint is at adjacent edges of the container engaging portions. The container engaging portions include a plurality of annular bands for securely holding containers therein. The joint is formed by bonding the layers of plastic material between the edges of the container engaging portions. The joint is interrupted along its length to enable the joint and container engaging portions to stre...

An improved air conveyor for conveying a plurality of articles such as cans in an upright orientation between stations in a multi-step process includes an elongate deck having a plurality of openings for directing air upwardly and in a direction in which articles are to be conveyed and guides mounted to opposite lateral sides of the deck for maintaining articles upon the deck while being conveyed thereover. A top cover assembly includes at least one perforated panel vertically spaced above the d...

A scraper assembly for clearing manure deposits from a manure collection board associated with an animal cage arrangement includes a first scraper blade extending in a generally diagonal direction with respect to a length of the collection board, but only partially across a width of the collection board, in an area of maximum manure deposits. The scraper assembly further includes a second scraper blade extending in a substantially opposite generally diagonal direction with respect to the diagona...

A metallurgical dart includes an enlarged refractory head having a top, a bottom, and a central through hole extending from top to bottom of the head and lined with a metallic sleeve, with a portion of the lining sleeve projecting beyond the top and/or bottom of the head; an elongate tail of refractory material with an external and/or internal metallic element and of external diameter slightly less than the internal diameter of the lining sleeve, such that the tail can pass, as a close fit, thro...