Abstract: A helmet device with retractable visor conceals a retractable visor within a safety helmet wherein the visor is extendable when necessary to protect a wearer against wind and rain. The device includes a rigid shell configured to cover a human head. The shell has a top portion, an open bottom portion, and a pair of sides extending between the top portion and the open bottom portion. A gap is formed between the sides and the top portion of the shell. A visor is retractable into the shell and is selectively positionable between an extended position and a storage position wherein the visor exposes the gap in the storage position and covers the gap in the extended position. A tab is coupled to the visor and extends outwardly from a bottom edge of the visor wherein the tab is configured to prevent the visor from extending fully into the shell.

Abstract: A stent deployment catheter includes a catheter body extending to an elongated distal end portion adapted for supporting and deploying a stent having a cylindrically shaped sidewall expandable in a vessel lumen to treat lesions. The distal end portion bearing the stent is guided within vessel lumen to a site therein to treat the lesions. Two guide wires are placed one in each of the bifurcations of a branched vessel. A guide wire lumen in the catheter is used to direct the elongated distal end portion along the guide wire to a vessel branch containing the lesions and a side branch guide wire lumen protectively isolates a length of a side branch guide wire from the stent when supported by the elongated distal end portion to establish a predetermined deployment site for a distal end portion and a proximal end portion of the stent for treating lesions of the first branch.

Abstract: A stent deploying catheter and method for placing a stent in a branching anatomic duct commencing at the ostium includes a distal portion containing a forward facing abutment surface laterally offset from a proximal end of a forward extending stent carrier. The forward facing abutment surface overlies the radio opaque marker to aid in the orientation and placement of the stent. The forwarding extending stent carrier in one embodiment includes a catheter balloon and having a length sufficient for supporting and deploying a stent to treat an ostial bifurcation lesion. The stent carrier in another embodiment includes a sheathing which can be retracted for deploying a self-expanding stent. An actuator wire extends along the catheter for angularly displacing the distal end portion in a body vessel to align the abutment surface with a common vessel wall at the crux of a vessel bifurcation and align the stent carrier along the site of the ostial bifurcation lesion.

Abstract: A video distance learning system including a teaching classroom connected to remote learning classrooms by a fiber-optic communication network. The teaching classroom includes at least a rear audio/video cabinet housing four video monitors and a camera. The remote classrooms have front cabinets with four monitors and a camera. In a normal operating mode, one of the video monitors will display the teacher, while the other three monitors display classroom images. A rear video camera mounted is focused on the teacher and a front video camera may be focused on the students. The front video cabinet may have a graphics or document camera is also provided on the front video cabinet. The document camera points downward at a light table to image materials such as books, pictures and overhead transparencies. The teacher may switch between the rear camera, the front camera and the document camera. A teacher's work station, may be located at the front of the teaching classroom.

Abstract: There is provided an excimer laser catheter which also has at the distal end thereof a tip-deflecting wire, such as a relatively small-size balloon catheter, one which is located alongside and to one side of the laser catheter and is adapted to be used by being activated to cause the laser to be located eccentrically with respect to the lumen of the blood vessel which it has entered and to be directed at adjacently located plaque which the laser would otherwise miss. With equipment of this kind, it is possible to perform in many instances a satisfactory angioplasty essentially with the laser alone, without incurring the delays and the risks and other drawbacks involved in using the conventional adjunctive balloon-catheter angioplasty following laser angioplasty. An ultrasonic transducer and a catheter tip is used to determine the location and morphology of atherosclerotic blockage.

Abstract: A refrigerator cabinet having a liner having sidewalls and a rear wall, each sidewall having a plurality of shelf supports mounted thereon, each shelf support including a supporting rail having a front portion and a rear portion separated by a gap, a cantilever half shelf and a full width sliding shelf mounted in the cabinet on the shelf supports, the sliding shelf having a depending stop in the gap engageable with the front portion of the supporting rail to stop forward motion, the cantilever half shelf having a cantilever arm cooperating with a bracket on the rear wall to prevent swinging motion, the cantilever half shelf also having a deflectable element or a plastic clip engageable with the front portion of the supporting rail to prevent swinging motion of the cantilever half shelf.

Abstract: An assembly of parts which form a stud for construction use. This stud assembly greatly reduces the material content of the stud assembly and reduces heat transfer and noise transmission over the known prior art and comprises two parallely arranged U-shaped channels interconnected by a novel mesh connector which interconnects the channels at one or more points along their length and is expandable only in a direction transverse to the longitudinal axes of the channels.

Abstract: An assembly of parts which form a new stud for construction use. This stud assembly greatly reduces the material content of the stud assembly and reduces heat transfer and noise transmission over the known prior art and comprises two parallely arranged U-shaped channels interconnected by a novel connector which interconnects the channels at one or more points along their length.

Abstract: A method for the determination of glycated protein in a sample characterised in that it comprises treating the sample with a protease and treating the protease-treated sample with a ketoamine oxidase, a product of this reaction being measured is disclosed.

Abstract: An immobilised hydantoinase containing a divalent metal ion selected from Mn.sup.++, Co.sup.++, Fe.sup.++, Ni.sup.++ and Mg.sup.++ is produced that is useful for the preparation of a D(-)(optionally substituted phenyl)glycine or N-carbamoyl derivative thereof by hydrolysis of a 5-(optionally substituted phenyl)hydantoin in the absence of air. Immobilization is carried out in the presence of the metal iona nd the metal ion stabilizes the hydantoinase and renders it capable of repeated re-use. The divalent metal ion may also be added to a reaction mixture containing the immobilized hydantoinase to minimize reduction of hydantoinase activity during hydrolysis of hydantoin. Cells that produce hydantoinase may be immobilized within or on a support, or hydantoinase separated from cells can be adsorbed on a positively charged polymeric support such as an ion exchange resin or covalently bonded to a polymeric support. A cross-linking agent such as glutaraldehyde may be used in immobilization.

Abstract: Methods are disclosed for recovering one or more of the metals of tungsten and molybdenum from metal-cellulose material. One method involves digesting the material in a mineral acid selected from the group consisting of hydrochloric acid having a concentration of at least about 4 normal, and sulfuric acid having a concentration of at least about 9 normal at a temperature of at least about 50.degree. C. for a sufficient time to form a digestion solid containing the major portion of the tungsten and a digestion solution containing a portion of any molybdenum which is present in the material, and separating the solid from the solution. Another method involves having as the starting material a metal-cellulose material comprising one or more of the metals of tungsten and molybdenum and elements selected from the group consisting of arsenic, phosphorus, silicon, and combinations thereof.

Abstract: A tungsten extraction process wherein tungsten values are extracted from an aqueous alkali metal tungstate solution by an organic solution containing an amine extractant wherein the organic solution consists essentially of from about 6% to about 10% by volume of said amine extractant, and the balance of said organic solution being an aromatic solvent consisting essentially of a mixture of alkyl benzenes wherein the alkyl benzenes have molecular weights of 120, 134, or 148 and the total number of carbon atoms in the alkyl chains attached to the benzene ring are either 3, 4, or 5, and thereafter the tungstate values are removed from the organic solution by stripping with aqueous ammonia, is improved by carrying out the stripping step in the aqueous continuous mode, and having as the stripping agent, an aqueous solution of ammonium metatungstate having a tungsten concentration which allows the strip solution to have a specific gravity of no greater than about 1.

Abstract: A lintel system includes a steel flange plate adapted to rest on the wall adjacent both sides of an opening to be spanned, a steel reinforcing structure integral with the flange plate and steel primary reinforcing rods welded to the reinforcing structure and extending upwardly. After the flange plate has been emplaced, two courses of masonry blocks are laid to encompass the primary reinforcing rods. Different embodiments of the invention employ different upper structures. In a first embodiment, a wooden beam directly overlays the upper plate, and each includes apertures generally aligned with and larger than the primary reinforcing rods, each of which is threaded to receive a nut along its terminal portion such that the nuts may be tightened to compress the lintel system into a rigid structure. In the second embodiment, the lintel system also includes secondary reinforcing rods welded to the lower face of the upper plate and extending downwardly into the interior space of the masonry blocks.

Abstract: A process is disclosed for separating tungsten from a solution containing tungstate and perrhenate ions. The process involves reacting a sufficient amount of hydrochloric acid with the solution at a sufficient temperature to form a solid containing essentially all of the tungsten and a liquor containing essentially all of the rhenium, and separating the solid from the liquor.

Abstract: A method is disclosed for producing ammonium metatungstate from ammonium paratungstate. The method involves first roasting the ammonium paratungstate at from about 275.degree. C. to about 300.degree. C. for from about 10 hours to about 20 hours to remove some ammonia and some water. The roasted ammonium paratungstate is then added to dilute solution of an ammonium metatungstate which is at a pH of from about 3.6 to about 4.2, the rate of addition being such that a slurry is produced having a pH of from about 3.6 to about 4.2. The pH of the resulting slurry is then adjusted to stabilize it at from about 3.6 to about 4.2 followed by evaporation to form a relatively concentrated solution of ammonium metatungstate which is then separated from any insolubles. Ammonium metatungstate is then crystallized from the relatively concentrated ammonium metatungstate solution.

Abstract: A dual follower variable valve timing mechanism for varying the timing of the intake and exhaust valves of an internal combustion engine. Adjacent sets of angularly offset cams are provided on a rotatable camshaft for actuating each valve of the engine, one cam of the set providing a short duration timing and the other cam of the set providing a long duration timing. A first follower for each set of cams has leading and trailing portions having control surfaces which conjointly engage the respective cams. A second, crescent-shaped follower is pivotally mounted in one end of the rocker arm that actuates the valve and has control surfaces which engage the first follower. Links connect the first follower with a crank which is rotatable in opposite directions by a control mechanism responsive to different operating parameters of the engine.In another embodiment, the first follower includes spaced pair of leading rollers and a central, trailing roller which engage the cams.

Abstract: A lubricating oil additive is produced by contacting an aqueous slurry of ammonium paratungstate with an organic phase comprising a major proportion by weight tertiary alkyl amines having the formula C.sub.n H.sub.2n+1 NH.sub.2, where n is from 18 to 22, to extract the tungsten into the organic phase from the aqueous phase while solid ammonium paratungstate is being solubilized into the aqueous phase. The aqueous phase is heated to drive off water so as to form the resulting lubricating oil additive.

Abstract: Side panels, terminating with inwardly directed flanges extend from the vertical edges of an upright main panel to form a generally channel shaped unit. The lower edge of each side panel is spaced above the lower edges of the main panel and the flanges to receive a conventional sill. A bearing plate extends inwardly from the lower edge of each side panel to rest upon the top of the sill. The upper edges of the side panels and the flanges terminate below the upper edge of the main panel to form a ledge for supporting a conventional beam. A recess, formed in the upper corner of the main panel, accommodates the beam and has a beam attachment plate extending therefrom.