Abstract:
A plastic molded wall covering that includes a plurality of one piece plastic molded corner moldings mounted in a vertically stacked array. The corner moldings each have a pair of front panels disposed at an angle to each other and formed with simulated building elements, such as hand laid stone. The corner moldings have respective upper and lower interlock devices and internal support and reinforcing walls extending rearwardly of the front panels in interconnecting relation to the interlock devices. The internal support and reinforcing walls have a curved serpentine configuration with a curved junction line with the respective front panels such that any plastic molded sink mark exposed on a front side of the front panels from the integrally formed internal walls similarly is undulating so as to blend into the simulated building elements and not detract from its natural appearance.
Abstract:
The invention relates to an improvement to the BMA process for the production of hydrogen cyanide from methane and ammonia in the presence of a platinum-containing catalyst. The problem of sooting, and thus the decrease in activity, of the catalysts can be reduced, or the activity increased, in that the catalyst is doped with an element from the series Cu, Ag, Au, Pd and W. The doping is preferably in the range of 0.01 to 20 mole % doping element, based on Pt.
Abstract:
An air flow mixer structure for a vehicle air conditioning system has a first conduit for a first air flow, a second conduit for a second air flow, an opening between said first and second conduits for merging said first and second air flows in a merging region and a common air channel for said merged air flows, the mixer structure having an air inlet region and an air outlet region opening into said merging region, the structure comprising plural air passages disposed between said inlet region and said outlet region for dividing an air flow at said inlet region into plural air flows at plural said openings into said merging region.
Abstract:
The invention concerns decompression locks releasing a flap or plate from their closed position in the event of overpressure. A decompression lock, employing the known principle of overcoming the retaining force of a spring (14) to achieve opening, employs a bolt (11) rotatably supported in a longitudinally displaceable support carriage (8). A detent spring (14) keeps the bolt (11) in the closed position and will release it at a predetermined overpressure. During assembly or in the event of forced opening, the decompression lock is moved into the closed position solely by closing the flap or plate.
Abstract:
A device for testing elongated objects, particularly wires, optionally with cross-sectional irregularities, which has a rotating test head traversed by the object and on which is provided a probe, particularly an eddy current probe, provided on rotary probe holding means and guided on circular paths about the object. For the change of the radial spacing between the object and the probe with the test head rotating, externally controllable e.g. by a sensor for irregularities, the device has a switching device with two inherently stable switching states, whereof one can correspond to a testing position near the object and another to a raised position further removed from the object and which can be rapidly set for protecting the probes.
Abstract:
Diphenylamine which is unsubstituted or substituted by alkyl or alkoxy groups can be prepared by treating appropriately substituted dicyclohexylamine with 1-10 bar of H.sub.2 over catalysts containing 0.05-5% by weight of rhodium at 250.degree.-450.degree. C. In addition to rhodium, the catalysts contain at least one other platinum metal from the group consisting of palladium, platinum and iridium on a support containing the noble metals in a total amount of 0.05-5% by weight, the percentage by weight of rodium with respect to all noble metals being 10-90%, and furthermore containing additives of 1-6% by weight of an alkali metal hydroxide and 1-6% by weight of an alkali metal sulphate. All percentages are based on the total weight of the catalyst.
Abstract:
A cap for a drinking cup is provided with an integral lip resting hutch of elliptical shape adjacent the edge of the cap. The peripheral wall of the cap adjoining the hutch is elevated and curved outwards. The hutch bottom surface and the elevated peripheral wall outside surface form acute angles with one another. The cap enables a patient to drink in the natural manner closing a discharge opening in the hutch area by his upper lip.
Abstract:
Trimethylolpropane is prepared in such a manner that butyraldehyde is metered into a mixture of water, alkaline condensing agent and formaldehyde, which contains less than 0.1 mol of methanol relative to 1 mol of formaldehyde, at temperatures from 15.degree. to 50.degree. C., and after addition of the butyraldehyde the reaction mixture is heated up to 90.degree. C., sufficient water being present in the reaction mixture so that the reaction mixture has a content of trimethylolpropane of 5 to 25% by weight after the reaction.
Abstract:
This disclosure relates to the processes for producing polycarbonates from specific crude bisphenols. The bisphenols are characterized in that immediately after their preparation they are subjected to (i) separation, of excess phenols and low-boiling substances, by means of an evaporator, and (ii) removal of monophenols by desorption.The invention also relates to high-molecular weight aromatic polycarbonates made of crude bisphenols and their use in a variety of applications.
Abstract:
An improvement in a process for the preparation of 2,2-dimethylolalkanal of the formula ##STR1## where R denotes an optionally substituted aliphatic radical by reacting 2-alkylacrylaldehyde with formaldehyde in presence of water and a base, the improvement residing in employing an aldehyde of the formula ##STR2## wherein R has the meaning indicated above and a mol ratio of the same to formaldehyde of 1:8-30 at a temperature in the range from -10 to 100.degree. C.