Abstract: The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300° C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.

Abstract: The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300 C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.

Abstract: The present disclosure provides novel polyimides having a high aliphatic monomer-content and improved optical properties and solubility relative to conventional polyimides. Also provided are methods of making the polyimides, articles of manufacture incorporating the polyimides and methods for making these, as well as methods of using the polyimides.

Abstract: The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300 C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.

Abstract: The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300 C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.

Abstract: The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300 C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances>80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.

Abstract: A non-stretched, negative birefringent copolyester film, which has been solution cast from toluene and/or MIBK and mixtures of these with other solvents on a substrate, and has a ?n? of >0.02 and a DP between 0.90 and 1.10.

Abstract: The invention provides a method of communicating between two devices performed by transmitting a series of pulses over an optical medium between the first device and the second device, the method including amplifying the pulses in an optical amplifier having a characteristic generally described by the NLSE with gain to yield parabolically shaped pulses.

Abstract: A splice closure contains multiple splice trays that can be individually pivoted and accessed so that the splice closure is capable of optimally carrying and providing access to numerous optical fibers and optical fiber splices. The splice closure has a housing defining an internal cavity and at least one opening to the internal cavity. An end cap is capable of occluding the opening of the housing to provide an enclosed configuration. A support frame has opposite front and rear ends, the front end of the support frame is connected to the end cap, and the support frame is capable of being positioned within the internal cavity of the housing during the enclosed configuration. The support frame extends in a longitudinal direction between the front and rear ends, and defines a frame axis that extends in the longitudinal direction.

Abstract: An outlet cover assembly is described that provides a base portion with a face plate opening for two face plates that are removable from the base portion. One of the face plates has a jack opening for retaining a jack therein. A retaining hook assembly for the jack is provided by a first hook detail that located on the face plate and a second hook detail located on the cover panel. When the face plate is secured within the face plate opening, the first and second hook details become aligned opposite one another and are operable to selectively engage hook portions on the jack. Because each of the hook details are formed on separate components, neither component must be formed using a collapsible insert.

Abstract: Disclosed is a light waveguide splice closure having lifting handles for removing the closure end cap. The closure contains an open top vessel for holding waterblocking material.

Abstract: A multiple access communications system for use between a base and a plurality of substations and having a first channel for transmission of data from the base to the substations and a second channel for transmission of data from the substation to the base. The system has, in use, provision at the base and/or substations for assigning each of the substations to one of a plurality of groups, and for allocating, from the base, each of a plurality of slots in the second channel to a particular group. There is provision at the base for reporting to the substation via the first channel the number of substations in each group, and there are analyzing means at each substation for analyzing the number of substations in each of the groups and for making a judgement based on those numbers as to which group to assign each respective substation to in order for that substation to communicate next with the base in the slot or slots allocated to that group.

Abstract: Masonry structures are susceptible to cracking due to distortion caused by movement of their foundation, vibration, and/or drying out subsequent to the construction of the structure. Such cracking often occurs after the structure has been painted. This results in the crack being transmitted through the coating of paint. Upon repainting of the masonry structure new cracks often develop and are transmitted through the paint coating within a short period of time.This invention discloses a crack resistant coating for masonry structures comprising:(1) a crack absorbing layer which is contiguous to the masonry structure which contains beads which are essentially spherical and which are bound by a resin binder, and(2) a conventional coating layer which is contiguous to and covers the crack absorbing layer.

Abstract: Masonry structures are susceptible to cracking due to distortion caused by movement of their foundation, vibration, and/or drying out subsequent to the construction of the structure. Such cracking often occurs after the structure has been painted. This results in the crack being transmitted through the coating of paint. Upon repainting of the masonry structure new cracks often develop and are transmitted through the paint coating within a short period of time.This invention discloses a crack resistant coating for masonary structures comprising:(1) a crack absorbing layer which is contiguous to the masonry structure which contains beads which are essentially spherical and which are bound by a resin binder, and(2) a conventional coating layer which is contiguous to and covers the crack absorbing layer.

Abstract: Masonry structures are susceptible to cracking due to distortion caused by movement of their foundation, vibration, and/or drying out subsequent to the construction of the structure. Such cracking often occurs after the structure has been painted. This results in the crack being transmitted through the coating of paint. Upon repainting of the masonry structure new cracks often develop and are transmitted through the paint coating within a short period of time.This invention discloses a crack resistant coating for masonry structures comprising:(1) a crack absorbing layer which is contiguous to the masonry structure which contains beads which are essentially spherical and which are bound by a resin binder, and(2) a conventional coating layer which is contiguous to and covers the crack absorbing layer.

Abstract: Masonry structures are susceptible to cracking due to distortion caused by movement of their foundation, vibration, and/or drying out subsequent to the construction of the structure. Such cracking often occurs after the structure has been painted. This results in the crack being transmitted through the coating of paint. Upon repainting of the masonry structure new cracks often develop and are transmitted through the paint coating within a short period of time.The invention discloses a crack resistant coating for masonry structures and a process for applying it, wherein the coating comprises:(1) a crack absorbing layer which is contiguous to the masonry structure which contains beads which are essentially spherical and which are bound by a resin binder, and(2) a conventional coating layer which is contiguous to and covers the crack absorbing layer.

Abstract: An acoustic lining for a flow duct has a first perforate skin fixed to an underlying sound-absorbing layer. The first perforate skin is overlain by a second perforate skin which forms the wall of the flow duct. One of the skins is relatively moveable in a sliding sense with respect to the other skin so as to vary the acoustic impedance of the duct wall as the perforations in the respective skins slide into and out of registration with each other. This enables the acoustic impedance of the duct wall to be varied to suit the flow and noise conditions prevailing in the duct and so obtain optimum noise attenuation in the duct, which may be the intake duct of a turbofan aeroengine.

Abstract: The present invention provides novel selenium containing additives for use as supplements in livestock feeds and processes for producing same. The novel supplements of the present invention use starch, especially wheat starch, as a carrier for the selenium-containing component and are remarkably homogeneous as regards distribution of the selenium content.