Abstract: The invention is generally accomplished by providing a photographic element and a process of its formation wherein a gelatin silver halide emulsion is provided with a thickener comprising a copolymer of the structure whereinA comprises about 10 to about 20 parts by weight of said copolymer, andB comprises about 80 to about 90 parts by weight of said copolymer.It is particularly preferred that the copolymer be provided in a hardener layer to minimize the amount of gelatin needed and thus reduce the reaction of hardener with gelatin. The invention finds a preferred use in curtain coating wherein there is a greater need for high viscosity materials, particularly at the bottom of a group of layers in order to minimize distortions of the layers as they are applied in the curtain coating process.

Abstract: A blowing agent for foaming polystyrene consisting essentially of at least one low permeability volatile organic compound, at least one low volatility non-volatile organic compound and, optionally, at least one high volatility non-volatile organic compound. In one embodiment, the low permeability volatile organic compound is selected from the group consisting of isopentane and isobutane, the low volatility non-volatile organic compound is acetone and the high volatility non-volatile organic compound is carbon dioxide. The blowing agent of the present invention may be used to foam a polystyrene foam structure. The blowing agent is directed to achieving low fugitive volatile organic compounds (VOC) emissions.

Abstract: An improved cartridge and method of dispensing test elements therefrom, which seals off the elements from exposure to the atmosphere. The cartridge includes, at its end apertured to eject test elements, a cover plate, said plate optionally being biased into contact with the end-most test element to cover the fluid opening provided in all such test elements. To dispense that end-most element, a pusher blade engages and ejects the element as in conventional cartridges. Optionally, the opposite end of the cartridge is sealed with a duck-bill seal.

Abstract: A latch comprises first and second NFETs and a first inverter. Data is applied without inversion to the gate of the first NFET and via the first inverter to the gate of the second NFET. A third NFET has a drain connected to the sources of the first and second NFETs. A clock is applied to the gate of the third NFET. Thus, there is only one NFET subject to the constant switching the clock, and therefore the constant power dissipation caused by the clock. To latch the data from the first and second NFETS, first and second inverters are connected in paralle with each other such that the output of each inverter is connected to the input of the other inverter. The input of one of the inverters is connected to the drain of the first NFET and the input of the other inverter is connected to the drain of the second NFET. A second stage of latching is also disclosed.

Abstract: A movable overhead ventilation assembly is provided for use in a work facility to be positioned in close proximity to a source of airborne environmental material. The ventilation assembly includes a supporting frame located within the work facility. The frame includes a longitudinally-disposed overhead track. A movable chassis is carried by the track. A ventilation housing is carried by the chassis for overhead translational movement of the ventilation housing within the work facility. The ventilation housing includes a plurality of walls, and has at least two openings therein defining respective inlet and outlet zones thereof. An exhaust fan is located within the ventilation housing between the inlet zone and the outlet zone for creating an upwardly moving air stream in the area surrounding the source of airborne environmental material.

Abstract: Apparatus for reducing the leakage of working medium gases between the rotor and stator assemblies of a gas turbine engine is disclosed. Concepts for maintaining concentric correspondence between a stator outer air seal of a gas turbine engine and the arc circumscribed by blades of the rotor assembly are discussed. Techniques for uniformly distributing the cooling air about the inner circumference of the case to control thermal distortions of the case and techniques for sealing the working medium flow are employed in one embodiment.

Abstract: A charge coupled device in which a row of electrodes is deposited over an insulating layer on a substrate has clocking pulses applied to some electrodes for clocking charge packets from source to drain gates and a steady or long pulses applied to other, tapping, electrodes. Amplifying circuitry connected to each tapping electrodes non-destructively measures the change in capacitance under the tapping electrode as a charge packet passes under it.