Abstract: A process is provided for preparing a 7-oxabicycloheptane amino alcohol intermediate of the general structure ##STR1## (wherein the above structures represents (D) or (L) isomers) which is useful in preparing thromboxane A.sub.2 receptor antagonists. This intermediate is prepared by reacting mesoanhydride with an aryl amine ##STR2## wherein R is alkyl, CH.sub.2 OH, CO.sub.2 H or CO.sub.2 alkyl, to form the acid ##STR3## which is reduced by treatment with lithium aluminum hydride or diisobutylaluminum hydride or Red-Al to form the alcohol ##STR4## wherein R.sup.1 is CH.sub.2 OH when R is CO.sub.2 H, CO.sub.2 alkyl or CH.sub.2 OH, and R.sup.1 is alkyl when R is alkyl; where in the above alcohol R.sup.1 is CH.sub.2 OH, such alcohol compound is treated with an alkyl chloroformate in the presence of base such as an alkali metal alkoxide to form the alcohol ##STR5## which undergoes cleavage by treatment with alkali metal, ammonia and acid to form the amino alcohol intermediate.Where in the above alcohol R.sup.

Abstract: A clamp for a posting board having a clamp arm and hinge which provides the desired clamping force to retain papers on the board, as desired, and also providing a continuous opening force when rotated beyond a fulcrum position defined by a pivoting extension tab of the hinge and a cantilevered leaf spring.

Abstract: A corrugated board display structure has tabs for readily connecting a horizontally extending shelf to an upright support in such a manner that the load capacity of the shelf is significantly increased. Edge segments formed in an upright, folded portion of the shelf bear directly in end-to-end engagement with edge segments adjacent upstanding tabs of an upright support, and the depending tabs of the upright portion connected to the shelf are received behind the upstanding tabs of the upright support in order to thereafter retain the edge segments in continuous, flat contact. The longitudinal axes of the ridges and grooves of the corrugated panel forming the upright support are in generally parallel relationship to the longitudinal axes of ridges and grooves of the corrugated panel comprising the upright portion, so that the columnar strength presented by the corrugations of the support resist the load presented by the corrugated upright portion without bending of either corrugated panel in lateral directions.

Abstract: A fritless copper conductor composition suitable for overprinting on copper consisting essentially of (a) 10-50% wt. finely divided copper particles, (b) 90-50% wt. coarse copper particles, (c) 0.2-2% wt. reducible heavy metal oxide, (d) 0-1.0% refractory metal and (e) 0-5.0% of a high surface area noble metal, all the particles being dispersed in an organic medium.

Abstract: A crosslinkable composition of matter is provided, which comprises first and second chain extended diepoxide resins, one or both of which are modified by reaction with hydroxy functional secondary amine and one or both of which are modified by reaction with certain secondary amine terminated or carboxy terminated butadiene acrylonitrile copolymer resin. The first resin, diene functional aminoepoxy resin, and the second resin, blocked dieneophile functional aminoepoxy resin, are co-reactive at elevated cure temperature. The diene functional aminoepoxy resin comprises the reaction product of diepoxide with amine functional diene chain extending reactant and, optionally, monofunctional end-capping reactant such as monohydroxy functional diene, and certain modifying agents.

Abstract: A seal of the type resembling a padlock and comprising a plastic housing having a pair of apertures for receiving a shackle of the type formed of a U-shaped piece of wire which reversely bent end portions, the extreme ends of which are intended to dig into the walls of the body apertures to prevent removal of the shackle. The body is provided with at least one longitudinal groove which is centrally located between the position of the shackle apertures, and the ends of the shackle are sharpened or beveled in a manner such that if an excessive tension is applied to a shackle leg, the sharpened end will penetrate the side wall of the groove, pass across the groove or just behind the bottom of the groove, and enter the opposite groove wall. The shackle, or a portion of raised plastic from the bottom of the groove is thereafter visible in the groove and gives visual evidence of tampering.

Abstract: Polyimide film prepared from a precursor solutions of polyamic acid in a solvent can be dried during or following the thermal or chemical conversion step, which produces a polyimide, by adding to the solution a small amount of an alkyl ester of phthalic, terephthalic, or isophthalic acid, casting the solution on a flat surface and heating the solution on the flat surface at about 100.degree.-200.degree. C.; then, removing the resulting partially converted film from the flat surface and heating it, under restraint, to about 200.degree.-375.degree. C., to bring about complete conversion and remove virtually all of the solvent. Polyimide films are useful in various applications where high temperature resistance is required, including composites for aerospace applications and for circuit boards for electronic equipment.

Abstract: This invention relates to novel compounds of Formula I which are sulfonamides, agricultural compositions containing them and the method of using them as pre- and post-emergence herbicides and/or plant growth regulants.

Abstract: An electrical connector containing a switch which makes or breaks an electrical connection when the connector is plugged into or unplugged from a mating connector. The switch is located in an aperture in the electrical connector. It is capable of limited reciprocal motion parallel to the longitudinal axis of the aperture. The switch includes at one end a pair of normally touching contacts and a dielectric finger. Electrical connection is broken when the switch reciprocates so that the dielectric finger is interposed between the normally touching fingers and, likewise, electrical contact is made when the reciprocation movement of the switch removes the finger.

Abstract: Sulfonylurea compounds which contain dihydroisobenzofuran, dihydroisobenzothiophene, or isoindoline 4-sulfonamide substituents such as 1,3-dihydro-N-[(4-methoxy-6-methylpyrimidin-2-yl)aminocarbonyl]benzo[c] furan-4-sulfonamide and their use as agricultural chemicals, including plant growth regulants and herbicides.

Abstract: Spinning of polyethylene terephthalate yarn at speeds in excess of 5000 meters per minute using a gas management technique of the gas surrounding the threadline to control the temperature and attenuation profiles of a spinning threadline provides a means to produce a low crystallinity polyester yarn with a relatively high elongation to break.

Abstract: An aqueous dispersion of a melt processible, non-elastomeric copolymer of 80 to 99.5 mole percent tetrafluoroethylene and 0.5 to 20 mole percent perfluoro(n-propyl vinyl ether) and its preparation by gelling, drying, grinding and fluorinating the polymerization medium is disclosed.

Abstract: X-ray cassette having a casing, a fixed plate and a moveable plate within the casing, a film receivable between the plates, bias means including a cam riding surface for biasing the moveable plate toward the fixed plate by means of an actuating cam assembly, the biasing means including a pressure applying strap comprising a plurality of leaf spring elements, having variable cross-section and length, i.e., larger and longer as the leaf spring elements extend toward the center of the cassette. A buckler element may be present in the cassette to buckle the film from the plate.

Abstract: A fluid levitated generally convex support member particularly useful in supporting a pallet, plate or belt such that the pallet, plate or belt load may be moved in an air powered track system, the system including at least one concave track with means for supporting and guiding the convex member and the pallet, plate or belt thereabove on a thin film of pressurized air jetting from nozzles in the track. The support member includes a generally tubular, flexible and partly deformable outer member and means for internally stressing the outer member so that under load there will be controlled deformation thereof. The deformed member will be closely complementary to the track surface to maximize load carrying capacity while minimizing fluid support power requirements and the detrimental effect of track deformities.

Abstract: In a radio transceiving system of low bit-rate coded speech signals, to be installed on mobiles, the method allows the detection and correction of burst error present in the demodulated coded signal, in the receiver.This method allows error detection by distance measurements among the values of the decoded parameters in subsequent intervals and, in case of error, to substitute values obtained with linear-interpolation techniques for the erroneous parameters.

Abstract: N-(heterocyclicaminocarbonyl)arylsulfonamides in which the aryl radical is substituted in the 2-position by a carboxy radical, ester, thioester, or amide thereof; e.g. N-[(4,6-dimethylpyrimidin-2-yl)-aminocarbonyl]-2-methoxycarbonylbenzenesul fonamide or N-[(4,6-dimethoxy-1,3,5-triazin-2-yl)aminocarbonyl]-2-methoxycarbonylbenze nesulfonamide; are useful for the regulation of plant growth and as pre-emergence and post-emergence herbicides.

Abstract: Polyfluoro .gamma.-ketoester compounds are obtained by reaction of ethylenic monoolefins, a metal or quaternary ammonium cyanide, and a fluoroester. These compounds, which have a general formula R.sub.F C(O)CFYCF.sub.2 CO.sub.2 R.sup.1, can be copolymerized directly with fluorinated ethylenic monoolefins, or further reacted to form vinyl ether and allyl ether derivatives which may also be copolymerized with ethylenic comonomers, forming solid, moldable copolymers with useful properties determined by the nature of pendant functional groups R.sub.F.

Abstract: A cabinet maker's arch door or crown door marking gauge has side members attachable to a work table of a table saw or shaper. A spring band is held on the side members so that opposite sides of the band are perpendicular to the sides of a panel to be marked which is positioned between the side members. The band forms a symmetrical arch between the sde members which is marked on the panel. One side of the band is adjustably held by one side member so the length of the band between the side members, and thus the height of the arch between the side members can be varied. The side member are adjustably held on the support so the distance between the side members can be changed to permit marking panels of different widths.

Abstract: A method is disclosed for measuring the rate and/or extent of movement of oscillatory element positioned on an oscillating system by passing a reference beam towards a reference detector over a reference edge. The reference edge is fixed relative to the element. The measurement beam is directed towards the measurement detector over a measurement edge of a surface adapted to move together with the element relative to the reference edge. The movement of the measurement edge cuts the measurement beam as it moves into the path of the measurement beam. The rate and/or extent of movement of the element relative to the reference edge is determined by comparing the illumination received by each of the detectors. Apparatus is also disclosed for measuring the rate and/or extent of movement of an oscillatory element positioned on an oscillating system including a measurement edge adapted to move together with the element. A reference edge is maintained stationary relative to the measurement edge.

Abstract: A bidirectional transmission system with echo cancellation allows simultaneous interchange of digital information between an exchange and subscribers on a single transmission line. Data flows are transmitted by packets separated by short silence intervals within which clock signals are extracted and echo-cancellation adjustment is accomplished. Use of an adaptive equalizer and a single sampling operation per sampling period are possible.