Abstract:
Ammoxidation of propane or isobutane with NH₃ and 0₂ using (1) a mole ratio of paraffin:NH₃ in the range from 2 to 16 and a mole ratio of paraffin:O₂ in the range 1 to 10 and (2) a mixture of particulate catalyst compositions, the first being especially effective to promote formation of an unsaturated nitrile and an olefin from the paraffin, and the second catalyst composition being especially effective to promote the conversion of the olefin to the unsaturated nitrile. Catalytic compositions useful in the process are disclosed.
Abstract:
Disclosed are normally solid polymers that are the result of addition copolymerization of the monomers acrylonitrile, methyl methacrylate, -methylstyrene and/or styrene, and indene in the presence of an unsaturated rubbery polymer, said polymers containing 10-200 parts by weight rubbery polymer, 10-40 parts by weight acrylonitrile, 5-50 parts by weight methyl methacrylate, 5-45 parts by weight of one or both of styrene and -methylstyrene and 4-45 parts by weight indene in the polymer structure, per 100 parts by weight of the total parts of acrylonitrile, methyl methacrylate, styrene, -methylstyrene and indene combined in said polymer structure. Also disclosed are vinyl chloride polymers compounded therewith to increase the heat distortion temperature as well as the impact resistance.
Abstract:
A recombinant DNA plasmid comprising a tryptophan operon which encodes an anthrinilate synthese desensitized to feedback inhibition and an autoamplifying cloning vector and wherein said plasmid is able to replicate in a strain of Escherichia bacteria that is lacking of tryptophan operon.
Abstract:
Disclosed is ammoxidation of C₃ to C₅ acyclic alkanes with NH₃ and O₂ using (1) a mole ratio of paraffin:NH₃ in the range from 2 to 16 and a mole ratio of alkane:O₂ in the range 1 to 10 and (2) a mixture of particulate catalyst compositions, the first being especially effective to promote formation of an unsaturated nitrile and an olefin from the paraffin, and the second catalyst composition being especially effective to promote the conversion of the olefin to the unsaturated nitrile. Catalyst compositions useful in the process are also disclosed.
Abstract:
Laminated products comprising a substrate, a fluoropolymer film and a photocurable adhesive which is bonded to the substrate provide protection of the substrate. A process for bonding fluoropolymers to substrates comprises the steps of coating at least one surface of a substrate with a first layer comprising an epoxy-based photocurable adhesive composition, imparting a surface treatment to a fluoropolymer film enabling the film to bond with the adhesive composition, applying a fluoropolymer film as a second layer over the first layer and, exposing the substrate and the first and second layers to radiant energy sufficient to cure the adhesive composition and bond it to the substrate and the fluoropolymer film.
Abstract:
An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith, such as ash and sulfur. In this arrangement, an improved open flow, spiral nozzle is positioned above a flotation tank having a bath therein, and sprays an input slurry through an aeration zone into the surface of the water. The spraying operation creates a froth on the water surface in which a substantial quantity of particulate matter floats, while other components of the slurry sink into the water bath. A skimming arrangement skims the froth the water surface as a cleaned or beneficiated product.
Abstract:
A rolling shutter system employs a variable efficiency bi-directional drive mechanism which permits easy and quick raising of the rolling shutter while protecting against self-lowering of the shutter by reason of its own weight. The system also employs a novel operator for the bi-directional drive mechanism which is characterized by an easy and comfortable to grip bead string which also is attractive in appearance. The head string is trained about a sprocket wheel, and an overload slip clutch is provided between the sprocket wheel and worm gear drive to limit the amount of force that can be applied to the bead string during raising and lowering of the rolling shutter. Also provided is a novel shutter travel limit and locking device, a novel valance construction and a novel through the wall shaft assembly.
Abstract:
A photovoltaic array module incorporating a plurality of photovoltaic cell strips (11). Each cell strip (11) incorporates an electrically conductive substrate layer (22), a semiconductor body (23) deposited on the substrate layer (22), and a transparent electrically conductive layer (24) deposited on the semiconductor body (23). Electrically conductive filaments (20) is alternately connected to contact points (31) on the electrically conductive substrate layer (22) of one cell strip (11) and to contact points (32) on the transparent electrically conductive layer (24) of another cell strip (11). A first busbar (12) and a second busbar (13) are connected to the end cell strips (11) of the array to collect the electrical energy generated thereby.
Abstract:
An apparatus for making a photovoltaic module having a plurality of cell strips. The apparatus (10) includes a frame (11) and a support drum (25) rotatably received in the frame (11). The support drum (25) has a substantially curved surface (42) having a plurality of paired dowel guides (45) for registering cell strips (50) relative to the surface (42) and an interconnect mesh (36) relative to the cell strip (50). A plurality of paired complimentary clamp sets (51, 52) receive and secure the cell strips (50) and the interconnect mesh (36) to the support drum (25).
Abstract:
A photovoltaic device (10) includes an optically transparent, electrically conductive layer (22) and a second electrically conductive layer (13) both of which provide contact areas for electrodes. The photovoltaic device (10) consists of a plurality of at least two cells (11/12) in a tandem configuration. A first cell (11) may be made of an amorphous semiconductor and a second cell (12) may be made of two semiconductor layers (15/14) of different compounds having a heterojunction (16) therebetween. The amorphous semiconductor layer (21) of the one cell (11) has a surface which contacts the optically transparent, electrically conductive layer (22). One of the two semiconductor layers (14) of the second cell (12) has a surface which electrically contacts the second conductive layer (13). Means (18) for example a transparent, conductive layer, such as indium tin oxide, or a tunnel diode structure are provided to connect another surface of the first cell (11) and another surface to the second cell (12) so that the cells (11/12) are optically and electrically in series.