Abstract: A process for isomerizing an alpha methylated azetidinone alkyl ester to the corresponding beta-methyl isomer, which is an intermediate in the synthesis of 1-beta-methylcarbapenem antibacterial agents. The process involves treating the dianion of structure I, being the alpha isomer, with a P-H or S-H containing organic protic acid, organometallic Sn or Pb hydride, metallic cation salt or trialkyl borane, followed by quenching with an OH protic organic acid or mineral acid.

Abstract: A GTO switch is provided in which the upper base layer (gate) is formed by a diffusion step. An epitaxial layer grown over the upper base layer contains cathode and gate diffusions which are separated by an undiffused gap. This "buried base" technique provides precise control over the resistivity of the base. The cathode-gate gap provides increased reverse gate voltage capacity. Other features include a large anode short area and a double-layer-metal; contact structure on the cathode-gate surface.

Abstract: A weightlifting support belt is constructed of two layers of pliable material, fastened together with stitching along the layer peripheries. First and second straps, each with a D-shaped pull ring at its free end, extend longitudinally from opposite ends of a medial section of the belt. Transverse stitching lines divide the space between the layers into a series of transverse compartments spanning the width of the medial section. Flattened, helical coiled springs are contained in each compartment, acting as a flexure to stiffen the medial section while allowing localized torsional bending and arcuate flexing about axes running longitudinally of the medial section. Tape closure strips are provided on the straps for maintaining the straps in overlying relation to maintain the belt in a wrapping configuration about the lumbar region of an individual. An elastic cover strap, provided with a closure strip at its free end, overlies the outermost strap and D-shaped ring to maintain them against the inside strap.

Abstract: An improved semiconductor device, particularly a gate controlled switch is provided by optimally fitting an involute spiral cathode-gate structure into a substantially square device. 4N cathode-gate branches radiate from a central gate portion and intersect the perimeter of the square device region at predetermined locations, N per side, where N is an integer. Four of the branches tangentially intercept the square perimeter at a distance R from a centerline where R is the radius of the central gate portion. The origin of the branches is angularly displaced from the line connecting the die center to the tangential intercept point by (L/R)- arctan (L/R) radians where L is half the edge length of the square device region. Improved thermal performance is obtained by thermally coupling the cathode heat spreader to the gate as well as cathode portions of the device.

Abstract: (+)-5-Methyl-10,11-dihydro-5H-dibenzo[a,d]-cyclohepten-5,10-imine, and its pharmaceutically acceptable salts is useful as an anxiolytic, antidepressant, anticonvulsant, muscle relaxant and in the treatment of mixed anxiety-depression, minimal brain dysfunction and extrapyramidal disorders such as Parkinson's disease. The racemate of the compound is produced by a four-step synthetic process in about 65% yield from 5H-dibenzo[a,d]cyclohepten-5-one.

Abstract: Two species of a coumarin derivative are disclosed, both of which may be produced from a 7-hydroxycoumarin precursor. The one species is an oxime and the other is a .beta.-haloallyl ester.A method for making a psoralen compound in high yield comprises treating these coumarin derivatives with an acid to fuse a furan ring thereto, and recovering a 5'-methyl psoralen therefrom. The 5'-methyl psoralen may be produced in up to about 70% overall yield with respect to the 7-hydroxycoumarin precursor.

Abstract: A semiconductor thyristor device having a cathode region and an anode region comprises ballast means adjacent thereto. The device further comprises first and second electrode means which are positioned such that only the cathode region and the anode region respectively are contacted thereby. The present structure is compatible with conventional device structures.

Abstract: Method and apparatus for sensing jaw position and movements and for converting the sensed data to dental articulator settings for simulating said movement are disclosed. Included are a pair of clutches which are fitted to the patient's maxillary and mandibular teeth. The respective clutch plates are removably secured to the housing of a jaw movement recording device and to a movable indicia-bearing arm. At least three indicia are mounted at the inner end of the arm in a manner such that they are viewable from three mutually orthogonal directions. Photoresponsive means are included for sensing and/or recording the indicia during and/or following displacement of the indicia-bearing arm during and/or following condyle movements of the patient's mandible. By this means, information as to the position and skew angle of the indicia in three dimensions is provided.

Abstract: An improved tooth configuration for the contact surface of an electrical connector comprises a rearwardly sloping generally V-shaped upper surface peripherally circumscribed by upstanding side and rear walls communicating therewith along a sharp continuous edge. The apex of the V-shape is located at the communication of the obliquely disposed side walls and may have a height less than the height of the side walls at their distal ends. The teeth may be arranged in a series of parallel rows wherein the teeth in one row may be either similarly or oppositely oriented with respect to the teeth in an adjacent row.

Abstract: This invention relates to an adhesive for use in forming laminates of polyester impregnated fiberglass. This adhesive comprises a reaction mixture of 100 parts of a reactive hydrogen containing polymeric material of about 700 to 4500 molecular weight selected from the class consisting of polyester polyols, polyether polyols and polyester amides, an organic polyisocyanate, at least 5 parts to no more than about 200 parts of an inert powdery filler with the proviso that the filler shall not exceed that amount which renders the resulting mixture unspreadable and sufficient monomeric nitrogen containing polyol having 3 to 6 hydroxyls to be essentially equivalent to the excess polyisocyanate. Catalysts of the tin and amine type may be utilized, if desired. Amounts of 38, 52 and 80 parts of organic polyisocyanate per 100 parts of the polymeric material are some of the levels used in some of the examples.